Where does “weaselfish” come from?

weaselfish (English) comes from English Fish, from Old English fiscian, from Proto-West Germanic fiskōn, from Proto-Germanic fiskōną, from Proto-Germanic -ōną, from Proto-Indo-European -eh₂yéti, from Proto-Indo-European -yéti, from Proto-Indo-European yé- — he, she.

Ancestry of “weaselfish”, step by step

weaselfish traces back through two separate lines of ancestry.

via English Fish

StepLanguageWordMeaning
1EnglishFishThe constellation and zodiacal sign Pisces
2Old Englishfiscianto fish
3Proto-West Germanicfiskōnto fish, to catch fish
4Proto-Germanicfiskōnąto fish, to catch fish
5Proto-Germanic-ōnąCreates denominative verbs from nouns; Creates...
6Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
7Proto-Indo-European-yétiCreates intransitive, often deponent,...
8Proto-Indo-Europeanyé-
9Chichewaiyehe, she

via English weasel

StepLanguageWordMeaning
1EnglishweaselThe least weasel, "Mustela nivalis"; Any of the...
2Middle Englishweseleweasel, polecat; A meal made of a pig or a capon...
3Old Englishweosuleweasel
4Proto-West Germanicwisulāweasel
5Proto-Germanicwisulǭweasel
6Proto-Germanicwisō-European polecat, "Mustela putorius"
Every word from Chichewa iyeEvery word from Proto-Indo-European -yétiEvery word from Proto-Germanic -ōną