Where does “maxime” come from?

maxime (French) comes from Latin maxime, from Latin Maximus, from Proto-Italic *magisVmos.

maxime (French): maxim

Definitions

Step	Language	Word	Meaning
1	Latin	maxime	chiefly, especially, mainly, particularly; most,...
2	Latin	Maximus	the greatest
3	Proto-Italic	*magisVmos	—

maxime — Etymology, Origin & Word History | Etymology Explorer