Recorded 1949–2025 · United States
Kaylyn was most popular in 1994, when 464 American babies were given the name — ranking #992 that year. In 2025 it ranked #4,466, with 70 births. Across 1880–2025 the Social Security Administration has recorded 12,091 people named Kaylyn.
Kaylyn first appears in Social Security Administration records in 1949, which makes it about 76 years old as a recorded American name. It has been recorded in 73 of the 77 years since.
The Social Security Administration has recorded 12,091 American births named Kaylyn 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 11,915 are estimated to be alive today.
70 American babies were named Kaylyn in 2025, ranking #4,466 that year.
Kaylyn is falling. Across 2021–2025 it averaged 75 births a year, against 256 a year across 2011–2015 — a change of -71% 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 Kaylyn is a girl’s name — 99.7% of the 12,091 Americans given it were girls and 0.3% 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 11,915 Americans named Kaylyn are alive today — 99% of everyone ever recorded with the name. The median is 25 years old, and half are between 17 and 32.
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 Kaylyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org