Where does “trenta-u” come from?
trenta-u (Catalan) comes from Catalan trenta, from Old Catalan trenta, from Latin trīgintā, from Proto-Indo-European tridḱómt, from Proto-Indo-European tri-, from Proto-Indo-European tréyes — three.
trenta-u (Catalan): thirty-one
Ancestry of “trenta-u”, step by step