Where does “hiberna” come from?

hiberna (Romanian) comes from French hiberner, from Latin hībernō, from Latin hībernus, from Proto-Indo-European ǵʰey- — winter.

hiberna (Romanian): to hibernate

Definitions

Step	Language	Word	Meaning
1	French	hiberner	to hibernate
2	Latin	hībernō	—
3	Latin	hībernus	—
4	Proto-Indo-European	ǵʰey-	winter

hiberna — Etymology, Origin & Word History | Etymology Explorer