Ellen f. Greek Ἑλένη. The ultimate root of this name is uncertain, and the first attestation of the name in Greek is in Homer's Iliad.
The name of a 4th C Roman saint and empress consort, a 4th C Welsh saint, an 11th C Swedish queen consort, and a 12th C Swedish saint.
The popularity of the French form Elaine was influenced by various characters of this name appearing in medieval Arthurian romances.