Where does “ջրհոր” come from?

ջրհոր (Armenian) comes from Old Armenian ջրհոր, from Old Armenian հոր, from Proto-Indo-European syō(u)ro-.

ջրհոր (Armenian): well

Definitions

Step	Language	Word	Meaning
1	Old Armenian	ջրհոր	well; cistern
2	Old Armenian	հոր	well, cistern, tank; ditch-gully; son-in-law
3	Proto-Indo-European	syō(u)ro-	—

ջրհոր — Etymology, Origin & Word History | Etymology Explorer