Where does “Tronto” come from?

Tronto (Italian) comes from Latin Truentus, from Proto-Indo-European drem- — to run.

Ancestry of “Tronto”, step by step

Step	Language	Word	Meaning
1	Latin	Truentus	—
2	Proto-Indo-European	drem-	to run

Tronto — Etymology, Origin & Word History | Etymology Explorer