Gr. Myth. a queen of Sparta and the wife of Tyndareus: she is the mother (variously by Tyndareus and by Zeus, who visited her in the form of a swan) of Clytemnestra, Helen of Troy, and Castor and Pollux
L < Gr Lēda
See Leda in American Heritage Dictionary 4
Greek Mythology A queen of Sparta and the mother, by Zeus in the form of a swan, of Helen and Pollux and, by her husband Tyndareus, of Castor and Clytemnestra.