Water Planet Name Generator

Ocean world names for sci-fi settings and games

Sci-Fi500 namesUpdated Aug 2026Free · no sign-up

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Generate names for water planets and ocean worlds: survey catalog designations, coined alien names, settler names like Tidelock and Last Harbor, sea-god names from a dozen mythologies, and water words from real languages. Built for science fiction, space games and worldbuilding.

About water planet names

Water planets get named the same way every other world in science fiction does, but the ocean always leaks into the name. A survey crew logging a blue disc from orbit files it under a star and a numeral or a discoverer's possessive (Tau Ceti Blue, Okafor's Ocean, Gliese Deep), and the word Deep, Tide or Blue tends to stick even after the world gets a proper name. Colonists rename it for what it did to them: Landfall Shoals, Tidelock, No Shore, Last Harbor and The Drowned World all read as names chosen by people who expected land and found none.

Older or alien-sounding names draw on two deep wells. The first is mythology, because every seafaring culture had a water god and those names (Tethys, Varuna, Tangaroa, Mazu, Aegir, Yemaya, Watatsumi) carry instant weight. The second is ordinary words for water and sea in other languages, exotic to English ears but literal in meaning: Mizu, Moana, Samudra, Bahr, Vesi, Laut. Invented names tend toward liquid consonants and long vowels, so l, r, s, th and open a and u sounds (Thalassa, Ithlasse, Saerun, Vessuna) feel wet in the mouth, while hard k and g sounds feel like rock.

This generator mixes all of those registers, so you can name one ocean world or a whole sector.

How to choose water planet names

Match the name to who named it: catalog numbers and possessives for newly surveyed worlds, bleak settler names for colonies, mythic or coined names for worlds with old civilisations.
Use sea-god names sparingly and from the right culture: a human colony ship from Polynesia would plausibly name a world Tangaroa, a Chinese one Mazu, and mixing them at random dilutes the effect.
Borrow a real word for water or sea from a language your characters speak (Moana, Samudra, Vesi, Laut); readers who recognise it get a free piece of backstory.
Keep one-word coined names liquid: lean on l, r, s and th with long vowels, and save hard consonants for the rocky moons and asteroid belts around the water world.
If the planet is tidally locked or has an eyeball ocean, let the physics into the name: Tidelock, Eyeball World, Twin Tides and Spring Tide all tell a reader how the world works before you explain it.

Frequently asked questions

What is a good name for a water planet?

A good water planet name tells you either how it was found, who settled it, or what it feels like. Survey names like Gliese Deep or Reyes Blue, settler names like Last Harbor and No Shore, mythic names like Tethys or Varuna, and coined liquid-sounding names like Thalassa or Vessuna all work; pick the register that matches your setting.

Are there real ocean planets?

Astronomers have found candidate ocean worlds such as Kepler-22b, GJ 1214b and TOI-1452b, super-Earths whose density suggests they may be covered in water hundreds of kilometres deep. Within our own system, Europa, Enceladus and Ganymede hide global oceans under ice and are the closest thing to water worlds we know.

Why do so many sci-fi water planets have Greek or Latin names?

Real astronomy names moons and features after classical mythology, so Greek and Latin sea names (Oceanus, Thalassa, Tethys, Nereid, Triton, Amphitrite) feel official and scientific. Using them signals that your setting follows real naming conventions; using a non-Western sea deity instead signals a different dominant culture in your future.

How should I name islands, seas and cities on a water planet?

Settlements on an ocean world are usually platforms, atolls or seabed cities, so names like Skyreef, Kelpstead, Anchorage or Moonpool work for habitats, while the few seas and currents can take descriptive names (The Long Swell, Gyre, Sargasso) or the names of the ships and captains who first crossed them.

More like this

Browse categoryAll Sci-Fi

All 500 water planet 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: 38 names

Abyssal Plain
Abyssal Prime
Abyssia
Achebe Blue
Achernar Deep
Adaro
Aeaea
Aegir
Aequora
Agwe's Reach
Ahti Deep
Ahzeel
Aislinn Deep
Allsea
Almeida's Reach
Alsephina
Amaruqa
Amphitrite
Anahita
Anchorage
Antillia
Apam Napat
Apsu
Aqua Prima
Aqua Vitae
Aquamarine Drift
Aquaria
Aquarius Minor
Aquasphere
Aquila's Tear
Aquilon's Sea
Archipelago IX
Argo's Rest
Atlantis Nova
Atollia
Avalon Deep
Aztlan
Azure Vast

B: 31 names

Bahr
Balaena
Barnard's Lagoon
Baten Kaitos
Beacon Reach
Belisama
Bell Buoy
Bellwater
Benthos
Berg Drift
Bimini
Bioluminous
Blackfathom
Blackwater Abyss
Bluehaven
Bluelens
Boilwater
Boto
Brackenfall
Brannoc
Breakspine Reef
Breakwater
Brensel
Brightwater
Brine
Brine Pool
Brinefall
Brinewash
Bulwark Blue
Bunyip Deep
Buyan

C: 24 names

Caerulea
Calypso's Deep
Canopus Shoal
Cantre'r Gwaelod
Ceridwen
Cerulean
Cetacea
Chalchiuhtlicue
Charybdis
Chime Deep
Ciliqua
Cimmeria
Cloudsea
Cloudwater
Cobalt Deep
Coldbrine
Copais
Coralline
Corrigan's Sea
Coventina
Cunard's World
Cyanica
Cyclonia
Cygnus Deep

D: 21 names

Dagat
Darkwater
Daryo
Deepwater
Delacroix Tide
Delos Deep
Delta Blue
Deneb Kaitos
Diphda
Doldrums
Dolphinus
Doris
Dravvene
Dreamtide
Driftholm
Driftwood
Drizzleholm
Drowned Cathedral
Dunmere
Dwarka
Dylan Eil Ton

E: 11 names

Ebbworld
Echo Sea
Elysian Tide
Emberwater
Encantado
Endless Blue
Endless Shoal
Enki
Eridanus
Eskala
Eyeball World

F: 14 names

Faelune
Farwater
Fathom
Fathomdeep
Fathomless
Firefly Sea
Fjordhome
Floeworld
Floodtide
Flotsam
Foamhold
Fogbank
Fomalhaut Blue
Freshsea

G: 12 names

Galatea
Glassea
Glaucus
Gliese Deep
Glintwater
Glowtide
Graveyard Reef
Greyswell
Greywater
Gulfstream
Gwenhidwy
Gyre

H: 22 names

Hadal
Hadley's Drop
Hai
Halcyon
Halcyon Deep
Halloway's Drift
Halorin
Harborless
Hazereach
Hesperides
Highwater
Hollow Tide
Hotbrine
Hy-Brasil
Hydra Ultima
Hydraea
Hydropolis
Hydros
Hydrosheen
Hydrosphere Prime
Hyperborea Blue
Hyperhaline

I: 10 names

Iara
Icewater Blue
Ichthys
Ilvane
Indigo Reach
Iquarra
Irridene
Ishikawa Blue
Ithaca Blue
Ithlasse

J: 2 names

Jeju Deep
Jurate

K: 9 names

Kaiwai
Kanaloa
Kelpie
Kelpstead
Kepler's Tear
King Tide
Kitezh
Koltira
Kowalski's Mirror

L: 21 names

Lagoona
Lakeworld
Lalande Shoal
Landfall Shoals
Lantern Deep
Lapis
Last Harbor
Laut
Lerna
Lesbos Deep
Leviathan's Cradle
Lighthouse World
Lindqvist Deep
Longshore
Lorelei
Loruune
Lotus Deep
Lumen Sea
Lunaris
Luyten's Mirror
Lyonesse

M: 39 names

Maelstrom
Mami Wata
Manannan
Manawydan
Mare Caeruleum
Mare Infinitum
Mare Profundum
Mare Silens
Mare Vastum
Maresh
Marina Tertia
Mariner's Rest
Marinus
Maris
Marisca
Maritopolis
Mazu
Meltwater
Melusine
Menkar
Meridia
Meridian Blue
Meropis
Merrow
Miaplacidus
Mira's Tide
Mirenne
Mirrorlens
Mirrorsea
Mistmere Prime
Mizu
Mo'o
Moana
Moana Nui
Monsoon
Moonpool
Mor
Morwenna
Muir

N: 26 names

Naiad
Naiadis
Nammu
Naos
Nautilus
Nautilus Drift
Nehalennia
Neptunia
Nereid
Nereopolis
Nerissa
Nerites
Nethys
New Atlantis
New Lemuria
Nguyen's Deep
Nimuel
Nine Seas
Ningyo
Nixie
Njord's Reach
No Shore
Nodens
Nuliajuk
Nuur
Nyvelle

O: 19 names

Oceania Nova
Oceanid
Oceanus Hesperus
Oceanus Secundus
Oceanus Styx
Ogygia
Okafor's Ocean
Okeanos
Olokun
Ombrelle
Ondine
Ondraval
Onesea
Orcinus
Orinoco Blue
Orlaith
Orvanna
Oshuna
Oyelaran's Reach

P: 18 names

Pack Ice Deep
Pasifika
Pearlwater
Pelagia
Pelagopolis
Pelagos
Pellune
Pentecost Blue
Phaeacia
Pholis
Phosphor
Pisces Tertius
Piscina
Pontus
Poseidonis
Proteus
Proxima Tide
Prussian Deep

Q: 6 names

Qalupalik
Qeluna
Qirath Deep
Quiet Fathoms
Quilomar
Quornath

R: 15 names

Raincradle
Rainworld
Ran's Hall
Rangiroa Deep
Rarotonga Blue
Reefhaven
Reyes Deep
Rhodes Blue
Rigel Sea
Riptide
Roaring Forties
Ross Blue
Rusalka
Ryugu-jo
Ryujin

S: 69 names

Sabrina
Sadalmelik
Saerun
Sagara
Saint Brendan's Isle
Saltaire
Saltcradle
Saltglass
Saltmere
Saltreach
Saltspray
Saltworld
Samudra
Sapphire Expanse
Sargasso
Sargassum
Sato's Sea
Scaldsea
Scheria
Scorpius Deep
Scylla's Rest
Seabright
Seafoam
Seaglass
Sealock
Seawall
Sedna Deep
Sedna's Mirror
Selene's Pull
Selkie
Sennevar
Serpent's Sea
Seventh Swell
Shaodar

S, continued

Shelfworld
Shelsara
Shipwreck Shoals
Shoalworld
Silverspray
Sirenia
Sirenus
Skyreef
Skysea
Slackwater
Sleeping Sea
Slushsea
Sobek
Spindrift
Spring Tide
Squallhaven
Squid's Rest
Starlit Shoal
Steamsea
Stillsea
Stormcradle
Stormsea
Stormwall
Stormwrack
Stymphalia
Suhail
Sulis
Sunder Reef
Sunken Hope
Sunken Spire
Sunpool
Surgeworld
Sweetwater
Swellhome
Syzygy

T: 46 names

Tamaqua
Tamesis
Tanaka Shoal
Tangaroa
Taniwha
Tau Ceti Blue
Teegarden's Sea
Tenger
Tethys Prime
Tevalis
Thalassa
Thalassopolis
Thalassos Minor
Thawsea
The Blue Marble II
The Bluestone
The Drowned World
The Long Swell
The Pearl
The Teardrop
The Wide Water
Thetis
Thiruvan
Three Tides
Thule Deep
Tiamat's Cradle
Tidalis
Tidebound
Tidelock
Tidepool
Tidewater
Tir fo Thuinn
Tir na nOg
Tornwater
Trade Wind
Tranquil Blue
Trappist Pearl
Trilobite Sea
Triple Moon
Triton's Bounty
Tritonis
Tsovinar
Turquoise Shelf
Tuvalu Deep
Twin Tides
Typhoon's Eye

U: 6 names

Ulmaren
Ultramarine
Ulvathe
Umi
Undertow
Undine

V: 16 names

Vaelis
Vapor Sea
Varga's Folly
Varuna
Vashti Deep
Veleth
Vellamo
Velmaris
Vesi
Vesper's Ocean
Vessuna
Vineta
Voda
Vodnik
Vodyanoy
Vortex Prime

W: 15 names

Wai
Wai Ola
Warmwater
Watatsumi
Waterlens
Wavebreak
Wavecrest
Wavehollow
Wen's Mirror
Whisper Swell
Whitecap
Widowmaker
Windrow
Wolf 359 Aqua
Worldsea

Y: 6 names

Yacuruna
Yam
Yemaya
Ys
Ysella
Yssara

Z: 4 names

Zephyr's Sea
Zephyria
Zhaomar
Zoara