Anime Demon Name Generator

Anime demons are named in three recognizable registers, and picking the right one is most of the work. The first is the single ominous Japanese name: Demon Slayer's Akaza, Doma and Kokushibo, Jujutsu Kaisen's Sukuna, Mahito and Jogo, Inuyasha's Naraku. These are usually two or three syllables, written in harsh or unusual kanji, and they drop the surname entirely; the demon has left its human identity behind, so a character like Akaza only reveals his old name, Hakuji, in flashback. The second register is folklore: oni and yokai names such as Shuten-doji, Tamamo-no-Mae, Gashadokuro and Nue, plus the '-maru', '-hime' and '-doji' endings that mark a named spirit.

The third register is Western. Series like High School DxD, Black Clover, Iruma-kun and The Seven Deadly Sins borrow names from the Ars Goetia (Gremory, Sitri, Phenex, Asmodeus, Valac) and use them as noble houses, pairing them with European given names, or they invent heavy, Latinate Demon Lord names like Lucifero, Megicula and Zagred. A fourth, smaller style is the epithet: Chainsaw Man's Gun Devil and Bomb Devil, or Demon Slayer's Upper Rank titles placed in front of the name.

Choose the register that matches your setting. A Taisho-era slayer story wants single kanji names; an isekai demon realm wants Goetic houses and long Latinate names; a modern horror series can mix both.