Where does “esturnel” come from?

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

Ancestry of “esturnel”, step by step

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

esturnel — Etymology, Origin & Word History | Etymology Explorer