Eileen
Eileen, alternatively spelt Aileen, is an Irish feminine given name with the pronunciation aɪliːn. It is the anglicised spelling of the Irish Gaelic Eibhlín, which derives from the Gaelic version of Aveline, Aibhilín.
Aveline, which originally came to Ireland via the Normans, is an Old French version of the Old Germanic name Ava, of which the etymology is disputed. One theory traces it to the Germanic alfi, elf, or to possibly meaning desired.