Fiend Name Generator

'Fiend' is the umbrella term Dungeons & Dragons and Pathfinder use for the evil outsiders of the lower planes, and the different kinds have noticeably different naming habits. Devils are lawful evil: their names come from real Judeo-Christian and Renaissance demonology (Asmodeus, Mephistopheles, Baalzebul, Dispater, Mammon, Belial) and from D&D's Nine Hells (Zariel, Glasya, Levistus, Fierna). Devil names tend to be pronounceable, Latinate or Semitic in flavor, and often carry a title or epithet that sounds like a job description: Malzephar the Ledger-Keeper, Ozimar Debt-Taker. That fits creatures who trade in contracts.

Demons are chaotic evil and their names are meant to be ugly. D&D's demon lords (Demogorgon, Orcus, Graz'zt, Yeenoghu, Juiblex, Fraz-Urb'luu) set the pattern: guttural clusters, apostrophes, doubled consonants, and sounds that feel wrong in the mouth. Invented Abyssal names like Xul'gathis, Krosthulax, and Ghul'zerath follow suit. Yugoloths (daemons in Pathfinder), the neutral evil mercenaries between the two, get names like Anthraxus and Mydianchlarus that read as diseased and vaguely scholarly.

Much of the list comes from the Ars Goetia and the Lesser Key of Solomon, whose 72 spirits (Paimon, Stolas, Marchosias, Andromalius) have supplied fiend names to fiction for centuries. Use them for authenticity, or use the invented ones when you want a fiend that is entirely your own.