Sea Monster Name Generator

Legendary leviathans, krakens, and deep-sea terrors

Mythology & Religion1,000 names

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Generate sea monster names from world mythology, sailors' lore, and original deep-sea horrors: Norse krakens, Greek Scylla and Charybdis, Japanese umibōzu, Filipino Bakunawa, and lake monsters from six continents. Useful for nautical campaigns, kaiju fiction, ship's-log horror, and fantasy bestiaries.

About sea monster names

Sea monster names come from three traditions that overlap on any good map. The first is myth: Leviathan and Rahab in Hebrew scripture, Jörmungandr the Midgard Serpent in Norse Eddas, Scylla and Charybdis in the Odyssey, Tiamat in Babylon, Bakunawa the moon-eating serpent of the Philippines. The second is sailors' lore and natural history: the kraken (from Norwegian krake, a twisted or crooked thing), the whale-island Aspidochelone, and the fanciful trolual and ziphius on Olaus Magnus's 1539 Carta Marina. The third is the modern cryptid roster of lake monsters with affectionate nicknames like Nessie, Champ, Ogopogo, and Caddy.

A strong sea monster name usually does one of three things: it sounds ancient and untranslatable (Cirein-cròin, Akkorokamui, Iku-Turso), it describes the harm it does to ships (Hullbreaker, Keelbiter, the Sargasso Strangler), or it takes a title that crews would whisper (the Grey Swallower, the Trench King). Real prehistoric predators such as Mosasaur, Livyatan, and Dunkleosteus also make convincing monster names for science-flavored settings. Living deep-sea animals (Goblin Shark, Vampire Squid), the Latin beasts of medieval bestiaries (Draco Marinus), and whirlpools such as Corryvreckan do the same job.

Mixing these registers gives a bestiary depth: gods and titans of the sea for the top tier, named regional beasts for the middle, and nickname-style horrors for the creatures your characters actually meet.

How to choose sea monster names

  • Match the name to the water: Norse and Celtic names for cold northern seas, Polynesian and Japanese for the Pacific, Greek and Levantine for the Mediterranean, and Amazonian for rivers.
  • Titles with 'the' (the Wreck Warden, the Salt Bride) sound like something sailors named after a disaster; use them for one-of-a-kind monsters, and use compound names like Coldmaw for a species.
  • Lake and coastal cryptids get friendly nicknames (Nessie, Champ, Caddy); if you want the monster to feel local rather than cosmic, give it a pet name and a lake.
  • Real prehistoric names (Megalodon, Liopleurodon, Basilosaurus) are perfect for a hard-science or kaiju setting where the beast is an animal, not a god.
  • For Lovecraft-style horror, keep the name short and unpronounceable, or use a hushed epithet like the Drowned Choir instead of a proper name.

Frequently asked questions

What are the most famous sea monsters in mythology?

Leviathan (Hebrew Bible), the Kraken (Norse and Scandinavian lore), Jörmungandr the World Serpent, Scylla and Charybdis from the Odyssey, and Cetus, the sea beast slain by Perseus. Tiamat of Babylon and Bakunawa of the Philippines are equally important in their own traditions.

Where does the word kraken come from?

It comes from Norwegian krake, meaning something twisted or an unhealthy animal, and entered wider use through 18th-century Scandinavian natural histories that described a giant creature mistaken for an island.

How do I name a lake monster?

Real ones follow a simple formula: a friendly diminutive of the lake's name (Ogopogo for Okanagan, Champ for Lake Champlain, Nessie for Loch Ness, Bessie for Lake Erie). Take your lake's name and clip it.

Can I use these names in a published book or game?

Mythological and folkloric names are public domain. Avoid a few modern trademarked kaiju (Ebirah, Manda, and Titanosaurus are Toho characters) in commercial work. The list has not been checked against trademarks, so look up any name before you publish under it.

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All 1,000 sea monster names

This is the complete list the generator above draws its random batches from, sorted A to Z and grouped by first letter.

Plain text, one name per line.

A: 46 names

  • Abaia
  • Abyssal Maw
  • Abyssodon
  • Abyssos
  • Abzu
  • Acrophyseter
  • Adaro
  • Aegirocassis
  • Afanc
  • Ægir
  • Ægir's Hound
  • Ahti's Hound
  • Ahuizotl
  • Aido-Hwedo
  • Akhlut
  • Akkorokamui
  • Ala of the Storm
  • Albertonectes
  • Alligator Gar
  • Altamaha-ha
  • Amabie
  • Amemasu
  • Amhuluk
  • Ammit of the Nile
  • Amphitrite
  • Ananta
  • Anchordrag
  • Angakok's Serpent
  • Anglerfish
  • Anker-trold
  • Anomalocaris
  • Antaboga
  • Ao Guang
  • Ao Qin
  • Ao Run
  • Ao Shun
  • Apalala
  • Apep
  • Āraiteuru
  • Archelon
  • Architeuthis
  • Aristonectes
  • Aspidochelone
  • Atui-kakura
  • Ayakashi
  • Ayia Napa Sea Monster

B: 62 names

  • Bäckahästen
  • Bahamut
  • Bake-kujira
  • Bakunawa
  • Balena
  • Bane of the Bay of Biscay
  • Bangpūtys
  • Barnacleback
  • Barnaclejaw
  • Bashe
  • Bashmu
  • Basilosaurus
  • Bathynax
  • Bathys
  • Beakmaw
  • Bear Lake Monster
  • Beast of Busco
  • Beast of the Bass Strait
  • Behemoth of the Brine
  • Beisht Kione
  • Bell-Ringer of the Deep
  • Bellsinker
  • Benthokrator
  • Berberoka
  • Bergmaw
  • Bessie
  • Bête de la Mer
  • Bigfin Squid
  • Bishop-Fish
  • Black Dragonfish
  • Black Swallower

B, continued

  • Blackfin
  • Blackwater
  • Bladderwrack
  • Blóðughadda
  • Bloodtide
  • Bloop
  • Blue Men of the Minch
  • Bobbit Worm
  • Boiúna
  • Bolotnik
  • Bonebarb
  • Bonewake
  • Boobrie
  • Boto
  • Bownessie
  • Bowspritsnapper
  • Bozho
  • Brachauchenius
  • Breaker of Breakwaters
  • Briareos
  • Brinehide
  • Brinetusk
  • Bringer of Fog
  • Brosno Dragon
  • Brygmophyseter
  • Bufeo Colorado
  • Bukavac
  • Bunyip
  • Buwaya
  • Bylgja
  • Bythosaurus

C: 56 names

  • Caballo Marino
  • Cabeça-de-Cuia
  • Cabyll-ushtey
  • Cadborosaurus
  • Caddy
  • Camahueto
  • Cameroceras
  • Caoránach
  • Capricornus
  • Capstanwringer
  • Carbonemys
  • Ceffyl Dŵr
  • Ceto
  • Cetodrakon
  • Cetorhinus
  • Cetus
  • Chainlash
  • Champ
  • Charybdis
  • Chasmcaller
  • Chessie
  • Chilean Blob
  • Chimaera
  • Chimneycrawler
  • Chipekwe
  • Chudo-Yudo
  • Cipactli
  • Circhos
  • Cirein-cròin
  • Cladoselache
  • Cobra Grande
  • Cobra Norato
  • Coelacanth
  • Coffinfish
  • Coi Coi-Vilu
  • Coilfather
  • Coldmaw
  • Collector of Figureheads
  • Colossal Claude
  • Colossal Squid
  • Colossus of Sargasso
  • Con Rit
  • Cookiecutter Shark
  • Coralcrown
  • Corryvreckan
  • Coulobre
  • Counter of the Drowned
  • Cragclutch
  • Cressie
  • Cretoxyrhina
  • Crone of the Cold Seep
  • Crown-of-Thorns
  • Cthulhu
  • Cuchivilu
  • Curse of the Coral Sea
  • Cymbospondylus

D: 32 names

  • Daedalus Serpent
  • Dagon
  • Dakosaurus
  • Dakuwaqa
  • Dakwa
  • Dandan
  • Daughter of the Undertow
  • Deep One
  • Deepgloam
  • Deepgullet
  • Deinosuchus
  • Delphinos
  • Deltadrinker
  • Devil Whale
  • Devourer of Fleets
  • Dho-Sul
  • Diablo Rojo
  • Dingonek
  • Dirgewhale
  • Dobhar-chú
  • Dorudon
  • Drac
  • Draco Marinus
  • Draugen
  • Dread of the Dardanelles
  • Dredgeclaw
  • Driftwight
  • Drinker of Harbors
  • Drownsong
  • Dúfa
  • Dunkleosteus
  • Duskleech

E: 18 names

  • Each-uisge
  • Eater of Lighthouses
  • Ebbstalker
  • Ebirah
  • Echeneis
  • Edestus
  • Eel-King of the Estuary
  • Egede's Serpent
  • El Cuero
  • Elasmosaurus
  • Ellén Trechend
  • Encantado
  • Endoceras
  • Eth-Ulai
  • Eurhinosaurus
  • Eurybia
  • Eurypterus
  • Excalibosaurus

F: 19 names

  • Falak
  • Fangtooth
  • Fangwake
  • Fastitocalon
  • Father of Sharks
  • Fathomgrasp
  • Finfolk
  • Firthfiend
  • Fjordshade
  • Fjörulalli
  • Flathead Lake Monster
  • Floehorn
  • Foamfang
  • Fogtooth
  • Fossegrim
  • Frilled Shark
  • Frostwyrm of the Floes
  • Fuath
  • Funayūrei

G: 34 names

  • Gaasyendietha
  • Gajamina
  • Galeshell
  • Gallowsgill
  • Gambo
  • Gandarewa
  • Ganga's Makara
  • Gatekeeper of Gibraltar
  • Geosaurus
  • Ghost of the Grand Banks
  • Ghost Shark
  • Ghostgill
  • Ghul of the Reef
  • Giant Isopod
  • Giant Siphonophore
  • Glashtyn
  • Glaucus
  • Globidens
  • Globster
  • Gloomtide
  • Glutton of the Gulf Stream
  • Goblin Shark
  • Goliath Tigerfish
  • Gonakadet
  • Gonggong
  • Grandfather of Eels
  • Grandmother Squid
  • Greenland Shark
  • Grindylow
  • Grootslang
  • Guiron
  • Gulfmaw
  • Gullethound
  • Gulper Eel

H: 41 names

  • Hadalophis
  • Hadalspawn
  • Hafgufa
  • Hafgygr
  • Hafstrambr
  • Hag of the Horse Latitudes
  • Hagfish
  • Haietlik
  • Hainosaurus
  • Halidrakon
  • Hanzaki
  • Harborhag
  • Harrowfin
  • Hatchprier
  • Havmand
  • Hawserhook
  • Hefring
  • Heikegani
  • Helicoprion
  • Helmtaker
  • Herald of the Maelstrom
  • Himalayasaurus
  • Himinglæva
  • Hippocampus
  • Hipupiara
  • Hoarder of Anchors
  • Hookbeard
  • Horned Serpent
  • Horomatangi
  • Horror of the Hebrides
  • Horven
  • Hraan
  • Hrönn
  • Hrosshvalur
  • Hullbreaker
  • Hunger of the Humboldt
  • Hushwater
  • Hybodus
  • Hydrarchos
  • Hydrus
  • Hyneria

I: 19 names

  • Iara
  • Ib-Naru
  • Icetusk
  • Ichthyocentaur
  • Ichthyosaurus
  • Igopogo
  • Ikatere
  • Iku-Turso
  • Ikuchi
  • Illie
  • Imoogi
  • Inkanyamba
  • Inkcloud
  • Ipupiara
  • Irukandji
  • Island Whale
  • Iso-onna
  • Isonade
  • Issie

J: 9 names

  • Jaekelopterus
  • Japanese Spider Crab
  • Jasconius
  • Jenny Greenteeth
  • Jenny Haniver
  • Jiaolong
  • Jinja-hime
  • Jonah's Whale
  • Jörmungandr

K: 48 names

  • Ka'ahupahau
  • Kaijin
  • Kaikaifilu
  • Kaiwhare
  • Kaliya
  • Kamohoali'i
  • Kanaloa
  • Kappa
  • Kar Fish
  • Karkadann of the Deep
  • Karkinos
  • Karkotaka
  • Kataw
  • Kauhuhu
  • Keelbiter
  • Keeper of the Ninth Fathom
  • Kelpie
  • Kelpie of Loch Garve
  • Kelpmane
  • Kelpshroud
  • Ketomorph
  • Ketophagos
  • Ketos Aithiopios
  • Ketos of Joppa
  • Ketos Troias
  • Kihawahine
  • Kikituk
  • Kingstie
  • Kitezh Serpent
  • Klabautermann
  • Knellfish
  • Knucker
  • Kólga
  • Komokwa
  • Koolasuchus
  • Koromodako
  • Krabben
  • Kraken
  • Kraken of Bergen
  • Krakenops
  • Krillfiend
  • Kronosaurus
  • Kūhaimoana
  • Kujata
  • Kulullû
  • Kun
  • Kushtaka
  • Kussie

L: 32 names

  • Labbu
  • Labynkyr Devil
  • Ladon
  • Lady of the Labrador Current
  • Lagarfljót Worm
  • Lake Tianchi Monster
  • Lake Van Monster
  • Lambton Worm
  • Lampreylord
  • Lancetfish
  • Lanternjaw
  • Lariosauro
  • Lau
  • Leedsichthys
  • Lepus Marinus
  • Lernaean Hydra
  • Leviathan
  • Limpetking
  • Lindworm of the Loch
  • Lion's Mane
  • Liopleurodon
  • Livyatan
  • Lizzie
  • Llamhigyn y Dŵr
  • Longwang
  • Loosejaw
  • Lord of the Lee Shore
  • Lotan
  • Lough Ree Monster
  • Lukwata
  • Lusca
  • Lyngbakr

M: 73 names

  • Machimosaurus
  • Mãe-d'Água
  • Maelstrom
  • Magindara
  • Makara
  • Mama D'Leau
  • Mami Wata
  • Mamlambo
  • Man o' War
  • Manda
  • Manipogo
  • Marakihau
  • Margygr
  • Marmennill
  • Marrowbrine
  • Masalai
  • Mastcracker
  • Mastodonsaurus
  • Materpiscis
  • Mauisaurus
  • Mboi Tu'i
  • Megalodon
  • Megalograptus
  • Megalokampos
  • Megamastax
  • Megamouth
  • Megapiranha
  • Memphre
  • Merrow
  • Mesonychoteuthis
  • Messie
  • Mester Stoor Worm
  • Metriorhynchus
  • Midgard's Coil
  • Migo
  • Millalobo

M, continued

  • Minhocão
  • Mishiginebig
  • Mishipeshu
  • Mistwhisker
  • Mixopterus
  • Mizuchi
  • Mjøsormen
  • Mo'o
  • Mocha Dick
  • Moha-moha
  • Mokele-mbembe
  • Monkfish of the Baltic
  • Monoceros
  • Montauk Monster
  • Moonpuller
  • Morag
  • Moremore
  • Morgan of Llyn Tegid
  • Morgawr
  • Morgen
  • Morskoi Tsar
  • Morvarc'h
  • Mosasaur
  • Moskstraumen
  • Mother Hydra
  • Mother of Whirlpools
  • Mournwake
  • Muc-sheilch
  • Muckie
  • Muddrowner
  • Mugwump
  • Muirdris
  • Muirselche
  • Muldjewangk
  • Mulgwishin
  • Murkeye
  • Mussie

N: 43 names

  • N'ha-a-itk
  • Nāga
  • Naga Basuki
  • Naga Padoha
  • Nahuelito
  • Näkki
  • Namazu
  • Nammu
  • Nanaue
  • Naufragus
  • Nauthveli
  • Nautilodrakon
  • Nautophagos
  • Neapfang
  • Nehebkau
  • Nelly Longarms
  • Nereus
  • Nerites
  • Nessie
  • Nessiteras
  • Netrender
  • Ngalyod
  • Ngarara
  • Nguma-monene
  • Nguruvilu
  • Nightmare of Neptune
  • Nightmare of the Kattegat
  • Nightsurge
  • Nine-Coil
  • Ningen
  • Ningyo
  • Ninki Nanka
  • Nøkken
  • Normie
  • Nothosaurus
  • Nuckelavee
  • Nuggle
  • Nūn
  • Nure-onna
  • Nyaminyami
  • Nyktoteuthis
  • Nykur
  • Nyss

O: 25 names

  • Oarfish
  • Oarsplinter
  • Odobenocetops
  • Ogopogo
  • Oilliphéist
  • Old Barnacle
  • Old Hunger of Hudson Bay
  • Old Man of Monterey Bay
  • Old Man of the Sea
  • Old Ned
  • Old Sow
  • Old Splitfoot
  • Old Tom
  • Oloth
  • Onchopristis
  • Oniare
  • Onniont
  • Oozewalker
  • Ophiketos
  • Ophion
  • Ophiotaurus
  • Ophthalmosaurus
  • Orca
  • Oss
  • Otodus

P: 45 names

  • Pacific Sleeper
  • Pal-Rai-Yûk
  • Palaeophis
  • Pale Rider of the Pack Ice
  • Parapuzosia
  • Pearleye
  • Peg Powler
  • Pelagophage
  • Pelagos
  • Pepie
  • Perucetus
  • Phantom Jelly
  • Phaya Naga
  • Phorcys
  • Physeter
  • Pincoya's Serpent
  • Pistrix
  • Pitchhide
  • Plankeater
  • Platecarpus
  • Plesiosaurus
  • Plesiosuchus
  • Pliosaurus
  • Plotosaurus
  • Polypus
  • Ponaturi
  • Ponik
  • Pontophidion
  • Pontus
  • Porcus Marinus
  • Porphyrios
  • Predator X
  • Pressie
  • Prince of the Cold Current
  • Prionosuchus
  • Prister
  • Prognathodon
  • Proteus
  • Protostega
  • Prowcrusher
  • Pterygotus
  • Ptychodus
  • Punga
  • Purussaurus
  • Python of the Deep

Q: 4 names

  • Qalupalik
  • Qat's Serpent
  • Qoth
  • Queen of the Kelp Forests

R: 26 names

  • Rahab
  • Rainbow Serpent
  • Rán
  • Ratu-mai-mbulu
  • Rauðkembingur
  • Raystown Ray
  • Reaper of the Ross Sea
  • Reefsplitter
  • Regalecus
  • Rep-un-kamuy
  • Rex Abyssi
  • Rhizodus
  • Rhomaleosaurus
  • Riftwalker
  • Rimeback
  • Ripcurrent
  • River Mumma
  • Ropewinder
  • Rosmarus
  • Rosualt
  • Rotgill
  • Ruamano
  • Rudderbane
  • Rukh of the Sea
  • Rusalka
  • Ryūjin

S: 106 names

  • Sachamama
  • Sailrot
  • Sailshredder
  • Salt Titan
  • Saltcrust
  • Saltstraumen
  • Saltwyrm
  • Samebito
  • San Clemente Monster
  • Sarcosuchus
  • Sawfish
  • Sazae-oni
  • Scourbelly
  • Scylla
  • Sea Bishop
  • Sea Devil
  • Sea Dog
  • Sea Goat
  • Sea Griffin
  • Sea Hog
  • Sea Krait
  • Sea Lamprey
  • Sea Monk
  • Sea Rhinoceros
  • Sea Satyr
  • Sea Serpent of Gloucester
  • Sea Stag
  • Sea Unicorn
  • Sea Wasp
  • Sea Wolf
  • Sea Wyvern
  • Seawrath
  • Sedna
  • Seileag
  • Selamóðir
  • Selma
  • Sentinel of the Sunda Strait
  • Seonaidh
  • Serpens Oceani
  • Serpent of Sligo
  • Serra
  • Shachihoko
  • Shadow over Scapa Flow
  • Sharlie
  • Shastasaurus
  • Shellycoat
  • Shen
  • Shepherd of the Drowned
  • Shesha
  • Shipwright's Bane
  • Shiranui
  • Shoalshadow
  • Shonisaurus

S, continued

  • Shony
  • Shuswaggi
  • Shuul
  • Siltcrawler
  • Silver Lake Serpent
  • Simbi
  • Simolestes
  • Singer in the Shallows
  • Sirena of Visayas
  • Sisiutl
  • Siyokoy
  • Sjøorm
  • Sjörå
  • Skerryscraper
  • Skolopendra
  • Skookumchuck
  • Skotoselache
  • Skötumóðir
  • Skrimsl
  • Sleeper in the Sound
  • Sleetcoil
  • Slimy Slim
  • Sobek
  • Solomonar's Serpent
  • Sorrow of the Skeleton Coast
  • Sower of Shipwrecks
  • Spinosaurus
  • Spumeback
  • Squalicorax
  • Squallwing
  • Squalodon
  • Squidmother
  • St. Augustine Monster
  • Star Kraken
  • Starswallow
  • Sternlurker
  • Stethacanthus
  • Stökkull
  • Stonefish
  • Stoorworm
  • Stormcaller of Sable Island
  • Stormfluke
  • Storsjöodjuret
  • Straitsnare
  • Stronsay Beast
  • Stupendemys
  • Styxosaurus
  • Suckerthroat
  • Suhurmašu
  • Sunkenmaw
  • Surfgrinder
  • Swallower of Islands
  • Swelltail

T: 179 names

  • Tambanokano
  • Tangaroa
  • Tangaroa's Hound
  • Tangie
  • Taniwha
  • Taniwhasaurus
  • Tannin
  • Tanystropheus
  • Tarasque
  • Tarbh-uisge
  • Tarscale
  • Taster of Keels
  • Te Parata
  • Te Wheke-a-Muturangi
  • Teggie
  • Telchines
  • Temnodontosaurus
  • Tenant of the Tonga Trench
  • Teran
  • Terrible Dogfish
  • Tessie
  • Teuthos
  • Thalassion
  • Thalassocnus
  • Thalassodon
  • Thalassomachos
  • Thalassomedon
  • Thalattoarchon
  • Thaumas
  • The Abbot of the Abyss
  • The Ballast Beast
  • The Ballast Bride
  • The Ballast Ghoul
  • The Barnacle Bride
  • The Bathyal Horror
  • The Bilge Mother
  • The Bilge Serpent
  • The Black Fathom
  • The Black Smoker
  • The Bloodwake
  • The Boneyard Bell
  • The Bottomless Throat
  • The Breathing Sandbar
  • The Bride of Low Water
  • The Cabin Thief
  • The Cape Verde Coil
  • The Captain's Debt
  • The Chart-Maker's Blank
  • The Cold Hand on the Rudder
  • The Cormorant's Dread
  • The Crooked Horizon
  • The Doldrum Devil
  • The Doom of Dogger
  • The Door in the Seabed
  • The Dredger's Catch
  • The Drift Net Queen
  • The Drowned Bell
  • The Drowned Cathedral
  • The Drowned Choir

T, continued

  • The Fathom Wyrm
  • The Ferryman's Rival
  • The Flensing Wind
  • The Ghost of the Goodwins
  • The Glass Tide
  • The Gravel-Voiced Singer
  • The Great Sea Serpent
  • The Grey Pilgrim
  • The Grey Swallower
  • The Hadal Thing
  • The Harbor Toll
  • The Harpooner's Lesson
  • The Harrow of Hatteras
  • The Hollow Whale
  • The Hundred-Fathom Hunger
  • The Hungry Mooring
  • The Hush Between Waves
  • The Iron Grin
  • The Kelp Mother
  • The Lamp Below
  • The Lantern Snuffer
  • The Lantern-Eyed Thing
  • The Last Sounding
  • The Leadline's Answer
  • The Lighthouse Keeper's Guest
  • The Listening Dark
  • The Lodestone
  • The Long Dark Eel
  • The Low Bell of Lyonesse
  • The Merry Men of Mey
  • The Midnight Swell
  • The Mile-Long Shadow
  • The Minch Maw
  • The Mouth of the Sound
  • The Ninefold Kraken
  • The Ninth Wave
  • The Oil-Black Tongue
  • The Oldest Current
  • The Pale Behemoth
  • The Patient Tide
  • The Pearl Diver's Sorrow
  • The Pilot's Regret
  • The Quiet Passenger
  • The Reef Wraith
  • The Rope Chewer
  • The Rust Gardener
  • The Salt Bride
  • The Salt Father
  • The Sargasso Strangler
  • The Scourge of Skagerrak
  • The Sea Vicar
  • The Sea's Long Memory
  • The Second Moon
  • The Silent Trawl
  • The Sixth Watch
  • The Skerry Hag
  • The Sleeper Under the Shoals
  • The Slow Green Eye
  • The Sounding Grave
  • The Starless Lagoon

T, continued

  • The Storm's Own Child
  • The Sundering Coil
  • The Sunless Shepherd
  • The Swelkie
  • The Tenant of the Wreck
  • The Terror of the Bermuda Deep
  • The Thing Under the Ice Shelf
  • The Thousand Mouths
  • The Tolling Reef
  • The Trench King
  • The Trench Widow
  • The Uncharted Guest
  • The Unlit Mile
  • The Upturned Keel
  • The Wake That Follows
  • The Weeping Anchor
  • The Whaler's Reckoning
  • The Whispering Bight
  • The White Squall's Daughter
  • The Widow's Fathom
  • The Widowmaker of Cape Horn
  • The Wraith of the Roaring Forties
  • The Wreck Warden
  • Thess-Ka
  • Thief of Tides
  • Thunderfluke
  • Thuồng Luồng
  • Tiamat
  • Tidecoil
  • Tidegnaw
  • Tie-Snake
  • Tieholtsodi
  • Tillertwister
  • Timingila
  • Titanichthys
  • Titanoboa
  • Titanosaurus
  • Tithe-Taker of the Tasman
  • Tizheruk
  • Tlaltecuhtli
  • Tlanusi
  • Topielec
  • Toyotama-hime
  • Trelquehuecuve
  • Trenchtongue
  • Triton
  • Trollhval
  • Trolual
  • Troughlurk
  • Trunko
  • Tuhirangi
  • Tupilaq
  • Tursas
  • Turtle Lake Monster
  • Tusoteuthis
  • Tūtaeporoporo
  • Tylosaurus
  • Typhon
  • Tyrannoneustes
  • Tyrant of the Thermocline

U: 16 names

  • Ugkoy
  • Uktena
  • Ukupanipo
  • Umi-nyōbō
  • Umi-zatō
  • Umibōzu
  • Undertow
  • Underwater Panther
  • Unhcegila
  • Unktehi
  • Unmaker of Maps
  • Urchinhide
  • Ureia
  • Ushi-oni
  • Ushumgallu
  • Uur-Athan

V: 19 names

  • Vacca Marina
  • Vadavagni
  • Valhalla Serpent
  • Vampire Squid
  • Varuna's Makara
  • Vasuki
  • Vaur
  • Ventdweller
  • Vetehinen
  • Vhuul
  • Viperfish
  • Vishap
  • Vodník
  • Vodyanoy
  • Void Whale
  • Vorax Profundi
  • Vortex
  • Vouivre
  • Vritra

W: 26 names

  • Wadj-wer
  • Wagyl
  • Walker on the Seabed
  • Wani
  • Wasgo
  • Watatsumi
  • Water Horse of Erne
  • Weaver of Riptides
  • Wee Oichy
  • Weirwatcher
  • Wels Catfish
  • Wharfgrinder
  • White River Monster
  • Whitecap Widow
  • Whowie
  • Winnipogo
  • Wishpoosh
  • Wolf Eel
  • Wolf of the White Sea
  • Wrackjaw
  • Wrackmother
  • Wrackspine
  • Wrecklight
  • Wreckwyrm
  • Wuzhiqi
  • Wyrm of Ness

X: 4 names

  • Xenacanthus
  • Xiangliu
  • Xiphactinus
  • Xiphias

Y: 9 names

  • Yacumama
  • Yacuruna
  • Yagim
  • Yam
  • Yamata no Orochi
  • Yawk Yawk
  • Yb-Tsoth
  • Yhul
  • Yurlungur

Z: 9 names

  • Zaratan
  • Zhaal
  • Ziphius
  • Ziz of the Waters
  • Zmajevit
  • Zmey Morskoy
  • Zombie Worm
  • Zuiyo-maru Carcass
  • Zygophyseter