Where does “Mēdus” come from?

Mēdus (Latin) comes from Ancient Greek Μῆδος, from Old Median Mada.

Ancestry of “Mēdus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Μῆδος	an inhabitant of Media; a Mede or Median
2	Old Median	Mada	—

Mēdus — Etymology, Origin & Word History | Etymology Explorer