Where does “finny” come from?

finny (Middle English) comes from Old English fyniġ, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz, from Proto-Indo-European -ḱos — -y, -ic.

Ancestry of “finny”, step by step

StepLanguageWordMeaning
1Old Englishfyniġmouldy, musty
2Old English-iġ-y, -ic
3Proto-West Germanic-gForms adjectives from nouns and verbs with a...
4Proto-Germanic-gaz-y
5Proto-Indo-European-ḱos-y, -ic

Words derived from “finny”

Every word from Proto-Indo-European -ḱos →Every word from Old English -iġ →Every word from Proto-Germanic -gaz →