The name Castor is a boy's name of Greek origin meaning "pious one". Castor and is often added to lists like Mythology Boy Names and discussed in our forums with posts like "Adding then Eliminating - Boys Themed".
From the experts:
Forget the oil. It's one of the twins that make up the constellation Gemini, and a mythological name on the cutting-edge of fashion; used by Metallica's James Hetfield.