Where does “-व” come from?

-व (Sanskrit) comes from Sanskrit कार, from Sanskrit कृ, from Proto-Indo-European kʷer- — to do; to make; to build.

Ancestry of “-व”, step by step

Step	Language	Word	Meaning
1	Sanskrit	कार	gain, prize, booty; contest, war; an act, action
2	Sanskrit	कृ	to make
3	Proto-Indo-European	kʷer-	to do; to make; to build

-व — Etymology, Origin & Word History | Etymology Explorer