Where does “koy-w-aʔ” come from?

koy-w-aʔ (Proto-Balto-Slavic) comes from Proto-Indo-European koy-w-.

Ancestry of “koy-w-aʔ”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	koy-w-	—

koy-w-aʔ — Etymology, Origin & Word History | Etymology Explorer