Kastor

This name derives from the Ancient Greek “kékasmai (κέκασμαι) / katharós (καθαρός) Kástōr (Κάστωρ),” meaning “one who excels, pure, clean.” In Greek and Roman mythology, Castor and Pollux or Polydeuces were twin brothers, together known as the Dioskouri. Their mother was Leda, but Castor was the mortal son of Tyndareus, the king of Sparta, and Pollux, the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg and their twin sisters Helen of Troy and Clytemnestra. Ancient Greek authors tell several versions of the story of Castor and Pollux. Homer portrays them initially as ordinary mortals, treating them as dead in the Iliad, but in the Odyssey, they are treated as alive even though “the corn-bearing earth holds them.”