Where does “ຮູບ” come from?

ຮູບ (Lao) comes from Sanskrit रूप, from Sanskrit रूप् — to form, shape.

ຮູບ (Lao): picture

Definitions

Step	Language	Word	Meaning
1	Sanskrit	रूप	outward appearance, color, form, shape; right...
2	Sanskrit	रूप्	to form, shape

ຮູບ — Etymology, Origin & Word History | Etymology Explorer