Where does “ministre” come from?

ministre (Old French) comes from Latin minister, from Latin minus, from Proto-Italic minos.

Ancestry of “ministre”, step by step

Step	Language	Word	Meaning
1	Latin	minister	attendant, servant, waiter; agent, aide;...
2	Latin	minus	nominative neuter singular of minor; accusative...
3	Proto-Italic	minos	—

ministre — Etymology, Origin & Word History | Etymology Explorer