Where does “द्वारा” come from?

द्वारा (Sanskrit) comes from Sanskrit द्वार्, from Proto-Indo-European dʰwṓr, from Proto-Indo-European dʰwer- — door.

Ancestry of “द्वारा”, step by step

Step	Language	Word	Meaning
1	Sanskrit	द्वार्	gate, door, entrance or issue; expedient, means,...
2	Proto-Indo-European	dʰwṓr	door
3	Proto-Indo-European	dʰwer-	door

द्वारा — Etymology, Origin & Word History | Etymology Explorer