Where does “гери” come from?

гери (Udi) comes from Old Armenian գերի, from Proto-Indo-European *wreh₁-.

гери (Udi): captive

Definitions

Step	Language	Word	Meaning
1	Old Armenian	գերի	captive, prisoner; group of captives
2	Proto-Indo-European	*wreh₁-	—

гери — Etymology, Origin & Word History | Etymology Explorer