Where does “Swamy” come from?

Swamy (English) comes from Hindi स्वामी, from Sanskrit स्वामिन्, from Sanskrit स्व, from Proto-Indo-Aryan swá, from Proto-Indo-Iranian swá, from Proto-Indo-European swé — self.

Ancestry of “Swamy”, step by step

Step	Language	Word	Meaning
1	Hindi	स्वामी	master, lord, owner; husband; saint
2	Sanskrit	स्वामिन्	an owner, proprietor, master, lord or owner of; a...
3	Sanskrit	स्व	his/her own; of self; one's self
4	Proto-Indo-Aryan	swá	—
5	Proto-Indo-Iranian	swá	self; reflexive pronoun
6	Proto-Indo-European	swé	self

Every word from Proto-Indo-European swé →Every word from Proto-Indo-Iranian swá →Every word from Proto-Indo-Aryan swá →