Where does “եմ” come from?

եմ (Armenian) comes from Old Armenian եմ, from Proto-Indo-European *h₁ésti.

եմ (Armenian): I am

Definitions

Step	Language	Word	Meaning
1	Old Armenian	եմ	to be
2	Proto-Indo-European	*h₁ésti	—

եմ — Etymology, Origin & Word History | Etymology Explorer