Latin word munus comes from Proto-Indo-European *moy-nós and ultimately Proto-Indo-European *mey- (change, swap)

Detailed word origin of munus

Dictionary entry	Language	Definition
*mey-	Proto-Indo-European (ine-pro)	change, swap
*moy-nós,	Proto-Indo-European (ine-pro)
munus	Latin (lat)	A burden, duty, obligation. A gift. A service, favor. A service, office, employment. A spectacle, public show.

Words with the same origin as munus