Kaylyn is a form of the English Kaelyn.
Kaylyn is also a form of the English Kaila.
Kaylyn is also a form (English) of the English and Irish Kayley.
Kaylyn is uncommon as a baby girl name. At the height of its usage in 1997, 0.024% of baby girls were named Kaylyn. It was #519 in rank then. The baby name has fallen out of favor since then, and is used only on a very modest scale now. Within the family of girl names directly related to Kaylyn, Kaylin was the most popular in 2018.
Baby names that sound like Kaylyn include Kaelyn, Kailin, Kailyn, Kalene, Kalin, Kalyn, Kaylin, Kaylyne, Kaylynn, Kaylynne, Caelin, Caelyn, Cailyn, Calin, Caylin, Caylyn, Kaalyn, Kaelan, Kaelani, and Kaelen.
† English pronunciation for Kaylyn: K as in "key (K.IY)" ; EY as in "ate (EY.T)" ; L as in "lay (L.EY)" ; IH as in "it (IH.T)" ; N as in "knee (N.IY)"