Where does “écureuil” come from?

écureuil (French) comes from Middle French escureul, from Old French escurel, from Vulgar Latin scuriolus, from Latin scūrius, from Latin sciūrus, from Ancient Greek σκίουρος, from Ancient Greek σκιά, from Proto-Indo-European (s)ḱeh₃ih₂ — darkness, shadow.

écureuil (French): squirrel