Recorded 1979–2025 · United States
Cailyn was most popular in 2009, when 401 American babies were given the name — ranking #1,347 that year. In 2025 it ranked #5,994, with 45 births. Across 1880–2025 the Social Security Administration has recorded 5,554 people named Cailyn.
Cailyn first appears in Social Security Administration records in 1979, which makes it about 46 years old as a recorded American name. It has been recorded in 45 of the 47 years since.
The Social Security Administration has recorded 5,554 American births named Cailyn between 1880 and 2025. That is recorded US births, not a world population — it counts people issued a Social Security number at birth in the United States. Of those, roughly 5,500 are estimated to be alive today.
45 American babies were named Cailyn in 2025, ranking #5,994 that year.
Cailyn is falling. Across 2021–2025 it averaged 53 births a year, against 226 a year across 2011–2015 — a change of -76% over the decade.
Measured on recorded births. American births overall have fallen since 2007, so most established names lose births over any recent decade — a name can shed births and still hold its rank. Compare the rank above, which is measured against the other names of the same year.
Across the whole record Cailyn is a girl’s name — 99.9% of the 5,554 Americans given it were girls and 0.1% were boys. In births since 2016 it is 99% girls and 1% boys.
Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.
Roughly 5,500 Americans named Cailyn are alive today — 99% of everyone ever recorded with the name. The median is 18 years old, and half are between 14 and 24. That is a narrow band: Cailyn arrived and faded within about a decade rather than staying in steady use.
An estimate, not a count. Recorded births are carried forward through the Social Security Administration’s 2023 period life table, by age and sex. That table describes mortality in one recent year, so it credits the oldest cohorts with today’s survival rather than the harsher rates they actually lived through — the further back a name peaked, the more this will overstate how many remain. It counts people issued a Social Security number at birth, not immigrants who arrived later.
How much more common the name is in each state than across the country as a whole.
See Cailyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org