Cailyn is a modern American spelling variant of Caitlyn, ultimately from Katherine — the Greek Katharos meaning pure — by way of the Irish Caitlín. Read more about the origin of this name below ↓
Cailyn is a modern American spelling variant of Caitlyn, ultimately from Katherine — the Greek Katharos meaning pure — by way of the Irish Caitlín. The Cailyn spelling emerged in the 2000s alongside the broader American trend of crafting fresh feminine variants with simple, sleek spellings. Cailyn peaked in 2009 within the broader Caitlin / Katelyn / Kaitlyn naming family that flourished in this era.
Cailyn remains a beloved choice. Timeless appeal across cultures and generations.
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How popular is Cailyn?
2009peak year
Today, Cailyn is a less common but recognizable name in U.S. records (ranked #2,496) with about 81 babies named Cailyn each year. At its height in 2009, Cailyn reached #723 nationally — 401 babies received it that single year. Its strongest stretch was the 2000s. Cailyn's usage has fallen in recent decades. In all, around 5,509 babies have been registered as Cailyn since 1880.
Year-by-year registrations1880–2024 · U.S. Social Security data
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