Where does “hibernatus” come from?

hibernatus (Latin) comes from Latin hībernō, from Latin hībernus, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “hibernatus”, step by step

Step	Language	Word	Meaning
1	Latin	hībernō	—
2	Latin	hībernus	—
3	Proto-Indo-European	ǵʰey-	winter

hibernatus — Etymology, Origin & Word History | Etymology Explorer