Cailyn is a girl name with a modern feel, drawn from real birth records. Below you'll find what Cailyn means and where it comes from, plus how many babies have been named Cailyn across the United States, UK, Ireland and New Zealand, how popular Cailyn has been over the decades, and the year it peaked.
Cailyn is a girl name of Irish (Gaelic) origin meaning “girl; slender”. A modern name related to the Gaelic cailin and to Kaylin.
| Country | Births on record |
|---|---|
| United States since 1880 | 5,554 births |
| England & Wales since 1996 | 87 births |
| Scotland since 1974 | 32 births |
| Northern Ireland since 1997 | 3 births |
| Ireland since 1964 | 5 births |
Counts come from official national birth-registration statistics: U.S. Social Security Administration, England & Wales (Office for National Statistics), Scotland (National Records of Scotland), Northern Ireland (NISRA), Ireland (Central Statistics Office) and New Zealand (Dept. of Internal Affairs). Coverage spans differ, so totals aren't directly comparable across countries.
Babies named Cailyn per year, United States (1979 to 2025). United States peaked in 2009 (401/yr) · England & Wales peaked in 2008 (11/yr) · Scotland peaked in 2009 (7/yr) · Ireland peaked in 2008 (5/yr) · Northern Ireland peaked in 2011 (3/yr).
Cailyn is an uncommon baby name in the United States. It was most common in 2009, when it ranked #1,348 nationally (given to 416 babies that year).
Colin · Collin · Callan · Kailani · Kaelyn · Galen · Kaylin · Kailyn
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