Where does “amistié” come from?

amistié (Old French) comes from Vulgar Latin amicitas, from Latin amīcus, from Latin amō, from Latin Deus, from Latin dẹ̄vos, from Old Latin deivos, from Proto-Italic deiwos, from Proto-Indo-European deywós — to be bright; sky, heaven.

amistié (Old French): Alternative form of amitié