Where does “գնդակ” come from?

գնդակ (Old Armenian) comes from Old Armenian գունդ, from Middle Iranian gund.

Ancestry of “գնդակ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	գունդ	spherical object, sphere, globe; arch of heaven,...
2	Middle Iranian	gund	—

գնդակ — Etymology, Origin & Word History | Etymology Explorer