Recorded 1981–2025 · United States
Kailyn was most popular in 2011, when 799 American babies were given the name — ranking #773 that year. In 2025 it ranked #3,160, with 118 births. Across 1880–2025 the Social Security Administration has recorded 14,351 people named Kailyn.
Kailyn first appears in Social Security Administration records in 1981, which makes it about 44 years old as a recorded American name. It has been recorded in 45 of the 45 years since.
The Social Security Administration has recorded 14,351 American births named Kailyn 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 14,210 are estimated to be alive today.
118 American babies were named Kailyn in 2025, ranking #3,160 that year.
Kailyn is falling. Across 2021–2025 it averaged 158 births a year, against 619 a year across 2011–2015 — a change of -74% 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 Kailyn is a girl’s name — 99.0% of the 14,351 Americans given it were girls and 1.0% were boys. In births since 2016 it is 97% girls and 3% 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 14,210 Americans named Kailyn are alive today — 99% of everyone ever recorded with the name. The median is 18 years old, and half are between 13 and 25. That is a narrow band because Kailyn is a young name — it only became common recently, so almost everyone carrying it is still a child or a young adult.
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 Kailyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org