Where does “mei” come from?

mei (Old Frisian) comes from Proto-Germanic midi, from Proto-Indo-European meth₂, from Proto-Indo-European mé — in the middle of, near, by, around, with.

Ancestry of “mei”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	midi	with, by, through; along, together
2	Proto-Indo-European	meth₂	with
3	Proto-Indo-European	mé	in the middle of, near, by, around, with

Every word from Proto-Indo-European mé →Every word from Proto-Indo-European meth₂ →Every word from Proto-Germanic midi →