Recorded 1998–2025 · United States
Kaidyn was most popular in 2012, when 278 American babies were given the name — ranking #1,721 that year. In 2025 it ranked #4,188, with 78 births. Across 1880–2025 the Social Security Administration has recorded 4,061 people named Kaidyn.
Kaidyn first appears in Social Security Administration records in 1998, which makes it about 27 years old as a recorded American name. It has been recorded in 28 of the 28 years since.
The Social Security Administration has recorded 4,061 American births named Kaidyn 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 4,026 are estimated to be alive today.
78 American babies were named Kaidyn in 2025, ranking #4,188 that year.
Kaidyn is falling. Across 2021–2025 it averaged 112 births a year, against 255 a year across 2011–2015 — a change of -56% 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 Kaidyn is a unisex name — 32.5% of the 4,061 Americans given it were girls and 67.5% were boys. It changed hands: since 2006 it has gone mainly to boys, having gone mainly to girls before that. In births since 2016 it is 19% girls and 81% 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 4,026 Americans named Kaidyn are alive today — 99% of everyone ever recorded with the name. The median is 13 years old, and half are between 8 and 17. That is a narrow band because Kaidyn 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 Kaidyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org