Where does “sturnellus” come from?

sturnellus (Late Latin) comes from Latin Sturnus, from Proto-Indo-European (s)tern- — starling.

Ancestry of “sturnellus”, step by step

Step	Language	Word	Meaning
1	Latin	Sturnus	—
2	Proto-Indo-European	(s)tern-	starling

sturnellus — Etymology, Origin & Word History | Etymology Explorer