Where does “escurel” come from?

escurel (Middle French) comes 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, from Proto-Indo-European (s)ḱeh₃- — darkness, shadow.