Where does “meng-” come from?

meng- (Indonesian) comes from Malay meng-, from Proto-Malayic *mAN-, from Proto-Malayo-Chamic *maN-, from Proto-Malayo-Sumbawan *maN-, from Proto-Malayo-Polynesian *maN- — inflectional prefix marking actor voice.

meng- (Indonesian): agent focus, frequently but erroneously called...