Where does “cownose” come from?

cownose (English) comes from English nose, from Middle English nōse, from Old French nous, from Latin nōs, from Proto-Italic nōs, from Proto-Indo-European wéy, from Proto-Indo-European éǵh₂ — I.

cownose (English): Any of various eagle rays of the genus...

Definitions

Any of various eagle rays of the genus...

Ancestry of “cownose”, step by step

cownose traces back through two separate lines of ancestry.

via English nose

Step	Language	Word	Meaning
1	English	nose	A protuberance on the face housing the nostrils,...
2	Middle English	nōse	nose
3	Old French	nous	Alternative form of nos
4	Latin	nōs	we, us
5	Proto-Italic	nōs	we
6	Proto-Indo-European	wéy	we
7	Proto-Indo-European	éǵh₂	I

via English cow

Step	Language	Word	Meaning
1	English	cow	An adult female of the species "Bos taurus",...
2	Middle English	cow	Alternative form of cou
3	Old English	cū	cow
4	Proto-West Germanic	*kō	cow
5	Proto-Germanic	*kōz	cow

Every word from Proto-Indo-European éǵh₂ →Every word from Proto-Indo-European wéy →Every word from Proto-Italic nōs →