Where does “-ɲaːj” come from?

-ɲaːj (Proto-Vietic) comes from Proto-Mon-Khmer ŋaaj.

Ancestry of “-ɲaːj”, step by step

Step	Language	Word	Meaning
1	Proto-Mon-Khmer	ŋaaj	—

-ɲaːj — Etymology, Origin & Word History | Etymology Explorer