Where does “ǵʰim-er-n-” come from?

ǵʰim-er-n- (Proto-Indo-European) comes from Proto-Indo-European ǵʰey- — winter.

Ancestry of “ǵʰim-er-n-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	ǵʰey-	winter

ǵʰim-er-n- — Etymology, Origin & Word History | Etymology Explorer