💡 GOOD TO KNOWStart with a colour word to tell readers what your oni looks like.
Start with a colour word to tell readers what your oni looks like.
Oni are the horned ogres of Japanese folklore. They are big, strong and often shown with red or blue skin, wild hair, tiger-skin loincloths and heavy iron clubs. This oni name generator builds names from Japanese-style sound pieces, joining colour words, nature words and classic name endings into fierce new names.
Choose male or female and press Generate for ten oni names. Use them for a boss in a samurai game, a demon in your manga or anime-style story, a monster in a D&D campaign set in an Eastern-inspired land, or a character at a Setsubun party. Each name is written in simple romaji, the Latin spelling of Japanese.
How to use the oni name generator
- Choose Male, Female or Any in the Style box.
- Press Generate names to get ten oni names.
- Look at the first part of the name; colour words like Aka and Ao hint at the oni's skin.
- Tap Copy or ♡ to save a name for your story or game.
Oni in Japanese folklore
Oni appear in Japanese tales for over a thousand years. They often live on remote mountains or islands and attack villages, as in the famous story of Momotaro, the Peach Boy, who sails to Onigashima, the island of oni, and defeats them. Another well-known legend tells of Shuten-doji, an oni chief on Mount Oe defeated by the warrior Minamoto no Raiko.
Oni are not always pure evil. In some regions they guard temples or bring good fortune, and many festivals feature them. During Setsubun, held each year in early February, families throw roasted soybeans and shout oni wa soto, fuku wa uchi, which means demons out, luck in.
What the name parts mean
Oni are often called by skin colour, such as aka-oni for a red oni and ao-oni for a blue oni. This generator uses those colour words and other Japanese roots to give each name meaning. The ending -doji appears in the names of legendary oni chiefs and means child or youth, while -maru is an old ending found in names of boys and swords.
- Aka: red. Ao: blue. Kuro: black.
- Tetsu: iron, like an oni's kanabo club.
- Kaze: wind. Rai: thunder. Iwa: rock.
- Kiba: fang. Yami: darkness. Hono: flame.
- Female endings: -hime means princess, -ko means child.
Female oni and the hannya
Female demons in Japanese stories are often tied to strong emotion. The hannya mask from Noh theatre shows a woman turned into a demon by jealousy, with horns and a fierce grin. A female oni name with a soft root and a hard ending, like Kurohime, captures that mix of beauty and danger.
Example names and what makes them work
| Name | Why it works |
|---|---|
| Akamaru | Red plus the classic -maru ending, a strong name for a red oni. |
| Kurodoji | Black plus the -doji ending used by legendary oni chiefs. |
| Tetsuzan | Iron mountain, perfect for a huge oni with an iron club. |
| Kurohime | Black princess, an elegant but dangerous female oni name. |
| Raiken | Thunder plus a sharp ending, good for a storm-calling oni. |
| Aoki | Short and simple, built on the word for blue. |
| Yukine | Built on the word for snow, fitting a cold mountain oni woman. |
| Kibagai | Fang-based name that sounds wild and hungry. |
Tips for picking the right name
- Start with a colour word to tell readers what your oni looks like.
- Use -doji for an oni chief to echo the great legends.
- Give a weaker oni a short two-syllable name, and a boss a longer one.
- Pair the name with a weapon, such as an iron kanabo, for a classic look.
- Show respect for the folklore by learning one real oni tale before you write.
Common questions
What is an oni?
An oni is a demon or ogre from Japanese folklore. They are usually large, horned and red or blue, carry iron clubs and live in mountains or on islands. Some stories show them as dangerous, others as guardians.
What do Aka-oni and Ao-oni mean?
Aka means red and ao means blue, so aka-oni is a red oni and ao-oni is a blue oni. They are the two most common colours in art, which is why this generator uses those colour words.
Can I use oni names in D&D?
Yes. D&D includes a creature called an oni, a shapeshifting ogre mage. These names suit it, as well as any horned demon or ogre in an Eastern-inspired setting.
Are these real Japanese words?
The pieces are real Japanese roots and common name endings, written in romaji. The full names are new combinations, so they sound Japanese and carry meaning while still being unique to your story.