Where does “Pernhild” come from?

Pernhild (Norwegian) comes from Norwegian Pernille, from Latin Petronella, from Latin Petronius, from Proto-Italic *kʷetru-.

Ancestry of “Pernhild”, step by step

Step	Language	Word	Meaning
1	Norwegian	Pernille	—
2	Latin	Petronella	—
3	Latin	Petronius	of or pertaining to the gens Petronia
4	Proto-Italic	*kʷetru-	—