Recorded 1897–2025 · United States
Kathlyn was most popular in 1951, when 125 American babies were given the name — ranking #1,384 that year. In 2025 it ranked #8,252, with 28 births. Across 1880–2025 the Social Security Administration has recorded 5,156 people named Kathlyn.
Kathlyn first appears in Social Security Administration records in 1897, which makes it about 128 years old as a recorded American name. It has been recorded in 127 of the 129 years since.
The Social Security Administration has recorded 5,156 American births named Kathlyn 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 3,271 are estimated to be alive today.
28 American babies were named Kathlyn in 2025, ranking #8,252 that year.
Kathlyn is rising. Across 2021–2025 it averaged 23 births a year, against 18 a year across 2011–2015 — a change of +32% 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 Kathlyn is a girl’s name — 100.0% of the 5,156 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 3,271 Americans named Kathlyn are alive today — 63% of everyone ever recorded with the name. The median is 53 years old, and half are between 31 and 73. That is a wide band, the mark of a name in steady use across generations rather than a passing fashion.
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 Kathlyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org