Where does “trenta” come from?

trenta (Old Occitan) comes from Latin trīgintā, from Proto-Indo-European tridḱómt, from Proto-Indo-European tri-, from Proto-Indo-European tréyes — three.

Ancestry of “trenta”, step by step

Step	Language	Word	Meaning
1	Latin	trīgintā	thirty; 30
2	Proto-Indo-European	tridḱómt	thirty
3	Proto-Indo-European	tri-	three, threefold
4	Proto-Indo-European	tréyes	three

Words derived from “trenta”

trenta

Every word from Proto-Indo-European tréyes →Every word from Proto-Indo-European tri- →Every word from Proto-Indo-European tridḱómt →