Castor and Pollux

Castor and Pollux were brothers from Greek mythology. The sons of Zeus (who had taken the form of a swan) and Leda, Castor was a skilled horse tamer, and Pollux was a pugilist. (PROSE: Wooden Heart) As sons of Zeus, they were siblings of Apollo, Athena, Artemis, Dionysius, Hebe, Heracles, Minos, Hermes and Persephone. (PROSE: Deadly Reunion)

Other references
Castor's name was used for other things, including a place near Peterborough, Olive Oyl's brother in Popeye cartoons, and a Century class spaceship. (PROSE: Wooden Heart)