Question

How did our modern word, crayfish, come about?

Answer 1

"The name 'crayfish' comes from the Old French word escrevisse (Modern French écrevisse) from Old Frankish *krebitja (cf. crab), from the same root as crawl. The word has been modified to 'crayfish' by association with 'fish' (folk etymology). The largely American variant 'crawfish' is similarly derived."

Answer 2

Crayfish, also called crawfish or crawdad, are closely related to the lobsters. The name "crayfish" comes from the Old French word escrevisse.for more details study;
http://crayfish.askdefine.com/