Where does “Perci” come from?

Perci (Old French) comes from Late Latin Persiacum, from Latin Persius, from Etruscan ?????.

Ancestry of “Perci”, step by step

Step	Language	Word	Meaning
1	Late Latin	Persiacum	—
2	Latin	Persius	—
3	Etruscan	?????	—

Perci — Etymology, Origin & Word History | Etymology Explorer