Where does “gnīm-” come from?

gnīm- (Proto-Celtic) comes from Proto-Indo-European ǵenh₁- — to produce, to beget, to give birth.

Ancestry of “gnīm-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ǵenh₁-	to produce, to beget, to give birth

gnīm- — Etymology, Origin & Word History | Etymology Explorer