Where does “հանդ” come from?

հանդ (Old Armenian) comes from Old Armenian անդ, from Old Armenian նո-, from Proto-Indo-European h₁nós.

Ancestry of “հանդ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	անդ	there, yonder, in that place; at that time, then;...
2	Old Armenian	նո-	that
3	Proto-Indo-European	h₁nós	—

հանդ — Etymology, Origin & Word History | Etymology Explorer