Aileen is a feminine given name that has Gaelic origins meaning "bright and shining." It is believed to be derived from the name Eileen, which is a variant of the name Helen. Aileen is a popular name in Ireland and Scotland, as well as in other English-speaking countries. Those with the name Aileen are said to be independent, intelligent, and determined individuals. Famous bearers of the name Aileen include American serial killer Aileen Wuornos and Irish actress Aileen Quinn.