Where does “osa” come from?

osa (Spanish) comes from Old Spanish ossa, from Latin ursa, from Latin ursus, from Ancient Greek Ἄρκτος, from Proto-Indo-European h₂ŕ̥tḱos, from Proto-Indo-European h₂r̥tḱós — destroying.

osa (Spanish): she-bear, sow, female bear