Recorded 1979–2025 · United States
Katlyn was most popular in 1995, when 1,260 American babies were given the name — ranking #463 that year. In 2025 it ranked #14,309, with 12 births. Across 1880–2025 the Social Security Administration has recorded 18,438 people named Katlyn.
Katlyn 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 47 of the 47 years since.
The Social Security Administration has recorded 18,438 American births named Katlyn 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 18,159 are estimated to be alive today.
12 American babies were named Katlyn in 2025, ranking #14,309 that year.
Katlyn is falling. Across 2021–2025 it averaged 16 births a year, against 75 a year across 2011–2015 — a change of -79% 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 Katlyn is a girl’s name — 100.0% of the 18,438 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% 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 18,159 Americans named Katlyn are alive today — 98% of everyone ever recorded with the name. The median is 29 years old, and half are between 25 and 33. That is a narrow band: Katlyn 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 Katlyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org