Where does “Jaya” come from?

Jaya comes from Sanskrit jaya, related to Sanskrit jī, though the precise meaning connection remains unclear.

Ancestry of “Jaya”, step by step

Step	Language	Word	Meaning
1	Sanskrit	जय	conquest, victory, triumph, winning, being...
2	Sanskrit	कर्ता	nominative singular of कर्तृ
3	Sanskrit	कर्तृ	—
4	Sanskrit	कृ	to make
5	Proto-Indo-European	kʷer-	to do; to make; to build

Jaya — Etymology, Origin & Word History | Etymology Explorer