Meaning This name is Celtic and means "Slender Lady". Origin of Kailyn Celtic , Irish Popular Middle Names Grace, Marie, Nicole, Olivia, Ruth, Saide, Sarahi, Virginia, May, Natalie Pronunciation 🔊 Listen Kailyn KEYLIHN Similar Names Kyleen Brygid Guennola Keilah Ronalda Beitris Arieen Keandra Berget Kiania Year by Year Popularity of Kailyn