Where does “na” come from?

na (Pali) comes from Sanskrit न, from Proto-Indo-Iranian ná, from Proto-Indo-European né — not; no.

na (Pali): no, not; that; him, it

Definitions

Step	Language	Word	Meaning
1	Sanskrit	न	no, not; no, not, none, no one, nothing, never,...
2	Proto-Indo-Iranian	ná	no, not
3	Proto-Indo-European	né	not; no

na — Etymology, Origin & Word History | Etymology Explorer