Where does “Castore” come from?

Castore (Italian) comes from Ancient Greek Κάστωρ, from Doric Greek κάστον.

Ancestry of “Castore”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Κάστωρ	—
2	Doric Greek	κάστον	—

Castore — Etymology, Origin & Word History | Etymology Explorer