The word 'crayfish' originally came from French as 'crevice'

'Crayfish' is a word borrowed from French 'crevice'. The word entered the English language some time around the 14th century.

crayfish [noun] [14th century]

• any of numerous freshwater decapod crustaceans (especially families Astacidea, Cambaridae, and Parastacidae) resembling...
• spiny lobster

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Etymology: By folk etymology from Middle English 'crevis' from Anglo-French 'creveis, escreveice' of Germanic origin; akin to Old High German 'krebiz' crab

See more loan words from 1300s.