This name derives from the Irish "Aisling" meaning “dream, vision” and referring to an “aisling”, a poetic genre that developed during the late 17th and 18th century in Irish language. Aisling was not used as a given name before the 20th century. The name Aisling was the thirty-first most popular name for baby girls in Ireland in 2005. Ashlyn was the 140th most popular name for baby girls in the United States in 2006, while its variant spelling Ashlynn was ranked at 293 for baby girls in 2006 in the United States. Ashlyn is also occasionally regarded as a modern name derivation from Ashley and Lynn.