Where does “ngecewain” come from?

ngecewain (Indonesian) comes from Indonesian nge-, from Betawi nge-, from Sundanese n-, from Proto-Malayo-Polynesian *maN- — inflectional prefix marking actor voice.

Ancestry of “ngecewain”, step by step

Step	Language	Word	Meaning
1	Indonesian	nge-	used to mark active subject on a verb, except in direct imperative sentence
2	Betawi	nge-	used to mark active subject on a verb
3	Sundanese	n-	active verb-forming prefix
4	Proto-Malayo-Polynesian	*maN-	inflectional prefix marking actor voice

Every word from Proto-Malayo-Polynesian *maN- →