My book lists a number of kinds of fishes and sea creatures.

The names are given in hiragana for all except that for squid for which it is
given in katakana. イカ

Does the word _ika_ come from another language and if so what language ?
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words etymology katakana
Does the word for squid (ika) come from another language?
I understand squid written in hiragana like
[いかのレシピ｜キッコーマン｜ホームクッキング](https://www.kikkoman.co.jp/homecook/series/ika02.html).

According to the explanation of [由来・語源辞典](http://yain.jp/i/%E7%83%8F%E8%B3%8A)
below, there are several theories and its etymology is still not clear. It may
come from the idea that squid seem to be solemn : "厳{いかめ}しい", or seem to be
angry : "怒{いか}っている".

I see it is also written in kanji : 烏賊{いか}. The dictionary says of why they
are written like that that there exists Chinese Proverb like so : Since the
squid is always floating on the water and the crows think he is dead, as they
are about to eat him, the squid reaches with his arms, and the crows become
his prey on the contrary.

So the 烏:crow + 賊:enemies. I am not sure whether it is also used for squid in
Chinese.

>
> イカの語源については諸説あり、はっきりしない。いかめしい形をしているからとする説や、怒った形をしているからとする説、「い」は白で「か」は堅い意とする説などがある。
> なお、漢字で「烏賊」と書くのは、イカはいつも水面に浮かんでいて、それを死んでいると思ったカラスが捕らえようとすると、腕を伸ばして鳥が逆にイカの餌食になってしまうという中国での言い伝えによる。
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### Does the word for squid ( _ika_ ) come from another language?

Adding on to kimi Tanaka's answer, I see in [the 日本国語大辞典 entry
here](https://kotobank.jp/word/%E7%83%8F%E8%B3%8A-430852#E7.B2.BE.E9.81.B8.E7.89.88.20.E6.97.A5.E6.9C.AC.E5.9B.BD.E8.AA.9E.E5.A4.A7.E8.BE.9E.E5.85.B8)
that the word _ika_ appeared in the 播【はり】磨【ま】風【ふ】土【ど】記【き】 of 715. There aren't
many long-form Japanese texts older than this, so we can say with some
certainty that, if this were a borrowing, it would have been borrowed during
the [Old Japanese](https://en.wikipedia.org/wiki/Old_Japanese) or [Proto-
Japonic](https://en.wikipedia.org/wiki/Japonic_languages#Proto-language)
stages of the language.

### Why is _ika_ written in katakana?

This question arises from your comments.

There are various terms that are written in katakana despite being native-
Japanese terms. Another example is アリ ("ant"). Years ago when on a university
homestay in Japan, a friend of mine was asked by her hostbrother what English
word アリ came from. He was convinced that it was a borrowing, since it was
written in katakana so often. However, it's a native-Japanese term -- it's
only written in kana because the kanji is unusual and hard to remember, and it
inconveniently has a lot of strokes: 蟻.

I suspect that 烏賊 might be written as イカ for similar reasons.
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