Cailyn

Cailyn is a feminine name of Irish and Gaelic origin, representing a modern anglicized spelling of the traditional Irish name Caoilfhionn, which means 'slender' or 'fair.' It can also be seen as a creative variation of Kaylin or a feminine form of Calen. The name began gaining popularity in the United States during the 1990s and early 2000s, part of the trend toward Irish-inspired names with contemporary spellings. While maintaining its Celtic roots, Cailyn offers a more intuitive spelling for English speakers than the traditional Irish form. The name has a gentle, melodic quality that contributes to its appeal. Cailyn strikes a balance between uniqueness and familiarity, making it recognizable without being overly common.

Pronounced CAY-lin.

As of October 2026, Cailyn ranked #3728 in US births in 2025 SSA, peaked at #723 in 2009.