Kaileen

Kaileen is a feminine name with Irish and Gaelic influences, likely derived from the name Caoilfhionn (pronounced KEE-lin), meaning 'slender' or 'fair.' The modern spelling adapts the traditional Gaelic name for easier pronunciation in English-speaking contexts. Kaileen emerged in popularity during the late 20th century alongside the trend for Irish-inspired names and creative 'Kay/Kai' prefixed names. It shares sonic qualities with popular names like Kaylee, Kayla, and Kathleen while maintaining its distinct identity. Though never reaching high popularity rankings, Kaileen has maintained a steady presence as a modern yet culturally-connected choice. Parents may choose Kaileen for its pleasing sound, Irish heritage connections, and balance between uniqueness and accessibility. The name carries a gentle, feminine quality with its flowing syllables.

Pronounced kay-LEEN.

As of October 2026, Kaileen ranked #4299 for girls in US births in 2025 SSA, peaked at #2258 for girls in 2022.