Where does “on” come from?

on (French) comes from Old French hom, from Latin homō, from Old Latin hemō, from Proto-Italic hemō, from Proto-Indo-European ǵʰmṓ, from Proto-Indo-European dʰéǵʰōm, from Proto-Indo-European -ōm, from Proto-Indo-European -mi.

on (French): one, people, you, someone; we