Where does “kaukāˀ” come from?

kaukāˀ (Proto-Balto-Slavic) comes from Proto-Indo-European klHk(ᵂ)-(n)-.

Ancestry of “kaukāˀ”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	klHk(ᵂ)-(n)-	—

kaukāˀ — Etymology, Origin & Word History | Etymology Explorer