Where does “coa” come from?

coa (Old Catalan) comes from Latin cauda, from Proto-Italic kaudā, from Proto-Indo-European keh₂udeh₂.

Ancestry of “coa”, step by step

Step	Language	Word	Meaning
1	Latin	cauda	A tail
2	Proto-Italic	kaudā	tail
3	Proto-Indo-European	keh₂udeh₂	—

coa — Etymology, Origin & Word History | Etymology Explorer