Where does “հին” come from?

հին (Armenian) comes from Old Armenian հին, from Proto-Indo-European sénos — old.

հին (Armenian): old; ancient

Definitions

Step	Language	Word	Meaning
1	Old Armenian	հին	old, worn, decayed; ancient, antique
2	Proto-Indo-European	sénos	old

հին — Etymology, Origin & Word History | Etymology Explorer