Dream or vision
Aislyn is a modern anglicized variant of the Irish name Aisling. It refers to a poetic genre developed in Irish language literature during the late 17th and 18th centuries, where Ireland is personified as a beautiful woman in a dream state.
Less common today
Aislyn isn't in the latest US Top 1000. It last peaked at #1,857 in 2015.
US births per 5-year period, 1990βpresent (SSA data).