Where does “of” come from?

of (Old English) comes from Old English æf, from Proto-Germanic *ab, from Proto-Indo-European apó.

of (Old English): of, from, off, out of

Definitions

Step	Language	Word	Meaning
1	Old English	æf	of
2	Proto-Germanic	*ab	—
3	Proto-Indo-European	apó	—

of — Etymology, Origin & Word History | Etymology Explorer