Where does “gaba” come from?

gaba (Proto-Celtic) comes from Proto-Indo-European ǵebʰ- — jaw, mouth; to eat, chew; branch.

Ancestry of “gaba”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ǵebʰ-	jaw, mouth; to eat, chew; branch

gaba — Etymology, Origin & Word History | Etymology Explorer