Eileen is a surprise riser in the name ranks in 2015. Irish Aileen continues to be more popular than Scottish Eileen, though both names have seen an unexpected resurgence since 2012. Nicknames for Eileen include Isla, Lee and Lina. Eileen is an Anglicized form of the Gaelic Eibhlin or Aibhilin. It was quite popular in the early part of the twentieth century.