Where does “а̀ванга̄рда” come from?

а̀ванга̄рда (Serbo-Croatian) comes from French avant-garde, from Old French avantgarde.

Ancestry of “а̀ванга̄рда”, step by step

Step	Language	Word	Meaning
1	French	avant-garde	vanguard; avant-garde, firing line
2	Old French	avantgarde	—

а̀ванга̄рда — Etymology, Origin & Word History | Etymology Explorer