Meaning & Origin
A female given name.
Kailyn is a girl's and boy's baby name of Irish origin, a variant of Kaylin or Cailín, from the Irish word meaning 'girl' or an anglicized form of the Irish Caoilfhinn meaning 'slender and fair.' It emerged in the 1990s-2000s as part of the wave of Kay/Kai-prefixed feminine names.
Kailyn has the bright, contemporary energy of names like Kayleigh, Hailyn, and Taylin — all built on Irish and English sounds that feel instinctively feminine. The ai spelling gives it a slightly more distinctive look than Kaylyn while keeping the same easy, breezy sound.