Recorded 1926–2025 · United States
Kai was most popular in 2022, when 5,732 American babies were given the name — ranking #90 that year. In 2025 it ranked #140, with 4,002 births. Across 1880–2025 the Social Security Administration has recorded 78,710 people named Kai.
Kai first appears in Social Security Administration records in 1926, which makes it about 99 years old as a recorded American name. It has been recorded in 80 of the 100 years since.
The Social Security Administration has recorded 78,710 American births named Kai 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 77,720 are estimated to be alive today.
4,002 American babies were named Kai in 2025, ranking #140 that year.
Kai is rising. Across 2021–2025 it averaged 4,904 births a year, against 2,482 a year across 2011–2015 — a change of +98% 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 Kai is mostly a boy’s name — 10.8% of the 78,710 Americans given it were girls and 89.2% were boys. In births since 2016 it is 7% girls and 93% 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 77,720 Americans named Kai are alive today — 99% of everyone ever recorded with the name. The median is 9 years old, and half are between 5 and 17. That is a narrow band because Kai 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 Kai on the interactive charts
About · Privacy · Contact
Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org