Where does “Fontaine” come from?

Fontaine comes from French fontaine, derived from Latin fons meaning "spring" or "fountain," with the diminutive suffix -anus.

Ancestry of “Fontaine”, step by step

Step	Language	Word	Meaning
1	French	Fontaine	—
2	Middle French	fontaine	fountain
3	Old French	fontaine	fountain
4	Latin	fontāna	—
5	Latin	fontānus	—
6	Latin	fons	a spring, a fountain; fresh water, spring water;...
7	Latin	fontis	genitive singular of fōns