A kappa's name literally means "river child." A tengu's name means "heavenly dog" — even though it doesn't look like one.
Twelve Japanese yokai names, and the surprising stories behind each.
12 Yokai Name Origins
01
Kappa (河童)
The name is thought to come from "kawa-warawa," meaning "river child," later slurred into "kappa." This water-dwelling creature is said to draw its strength from water held in a dish-shaped hollow on its head — a detail that lines up neatly with its "child of the river" name.
02
Tengu (天狗)
The word arrived from China during the Nara period as "tiangou," literally "heavenly dog." It originally described a meteor streaking across the sky with a thunderous roar, its blazing tail likened to a dog racing through the heavens. The familiar red-faced, long-nosed mountain spirit came much later.
03
Zashiki-Warashi (座敷童子)
The name is almost literal: "zashiki" is a formal tatami reception room in an old-style house, and "warashi" is a Tohoku dialect word for "child." A household said to host this child spirit was believed to prosper, while one it left behind was said to decline.
04
Nue (鵺)
This chimera, famously hunted down in The Tale of the Heike, takes its name from an eerie bird called the "nue-dori" — today's scaly thrush — whose cry it was said to share. The monster was apparently named for its voice before anyone described the rest of it: a monkey's head, a raccoon dog's body, a snake's tail.
05
Shuten-doji (酒呑童子)
The oni chieftain said to terrorize Mount Oe earned his name — literally "sake-drinking boy" — from his love of drink, according to the classic Oeyama Ekotoba scroll. Another theory traces it to "sute-doji," meaning "abandoned child," reflecting legends that he was orphaned young.
06
Tamamo-no-Mae (玉藻前)
A beautiful court lady serving Emperor Toba is said to have earned this name, roughly "jeweled seaweed," after her body glowed like a jewel one night when the palace lights went out. Later retellings revealed her true identity: a thousand-year-old nine-tailed fox.
07
Rokurokubi (ろくろ首)
"Rokuro" refers to the pulley mechanism used to raise a bucket from a well by winding a rope. Just as pulling the rope makes the bucket shoot upward, this creature's neck was imagined to stretch and retract the same way — the likely origin of its name.
08
Okuri-inu (送り犬)
A dog-like spirit said to trail travelers on mountain roads at night, its name means exactly what it sounds like: an "escorting dog." Trip and fall, and it's said to attack — but pretend to rest and thank it politely, and it will see you safely home instead.
09
Akaname (垢なめ)
Its name simply describes what it does: "aka" means grime, and "nameru" means to lick. It's said to appear in neglected, unwashed bathrooms to lick up the built-up filth — a fittingly literal warning against letting dirt pile up.
10
Tofu Kozo (豆腐小僧)
True to its name, this yokai is a small boy ("kozo") who wanders around carrying a tray of tofu. It first appeared in mid-Edo-period illustrated storybooks and, unlike most yokai, was almost entirely harmless — a mascot-like figure people found endearing rather than frightening.
11
Nurarihyon (ぬらりひょん / 滑瓢)
One leading theory splits the name into two old words: "nurari," meaning slippery or elusive, and "hyon," meaning unexpected or strange. Its kanji spelling, 滑瓢 — "slippery" plus "gourd" — echoes the same idea: a creature that's impossible to pin down.
12
Ittan-momen (一反木綿)
This Kagoshima yokai looks like a long strip of white cloth. "Ittan" is a traditional unit for a bolt of cotton cloth, roughly 10 meters, and "momen" means cotton — a name that describes its shape exactly, as it flutters through the dusk air and wraps around unlucky travelers.