Where does “مجار” come from?

مجار (Ottoman Turkish) comes from Hungarian Magyar, from Old Hungarian mogyër, from Proto-Ugric mańćɜ.

Ancestry of “مجار”, step by step

Step	Language	Word	Meaning
1	Hungarian	Magyar	—
2	Old Hungarian	mogyër	—
3	Proto-Ugric	mańćɜ	—

مجار — Etymology, Origin & Word History | Etymology Explorer