Where does “mithi” come from?

mithi (Old Dutch) comes from Proto-West Germanic midi, from Proto-Germanic midi, from Proto-Indo-European meth₂, from Proto-Indo-European mé.

Ancestry of “mithi”, step by step

Step	Language	Word	Meaning
1	Proto-West Germanic	midi	with, by, through; along, together; middle, mid
2	Proto-Germanic	midi	with, by, through; along, together
3	Proto-Indo-European	meth₂	with
4	Proto-Indo-European	mé	—

mithi — Etymology, Origin & Word History | Etymology Explorer