Where does “Tripura” come from?

Tripura derives from Sanskrit त्रिपुर, combining Sanskrit त्रि (three) with a second element, ultimately from Proto-Indo-European tréyes (three).

Ancestry of “Tripura”, step by step

Step	Language	Word	Meaning
1	Sanskrit	त्रिपुर	—
2	Sanskrit	त्रि	three
3	Proto-Indo-Aryan	tráyas	three
4	Proto-Indo-Iranian	tráyas	three
5	Proto-Indo-European	*tréyes	—

Tripura — Etymology, Origin & Word History | Etymology Explorer