Where does “này” come from?

này (Vietnamese) comes from Proto-Vietic -niː, from Proto-Mon-Khmer niʔ.

này (Vietnamese): this; here

Definitions

Step	Language	Word	Meaning
1	Proto-Vietic	-niː	—
2	Proto-Mon-Khmer	niʔ	—

này — Etymology, Origin & Word History | Etymology Explorer