Recorded 1880–2025 · United States
Leonidas was most popular in 2022, when 760 American babies were given the name — ranking #841 that year. In 2025 it ranked #1,027, with 591 births. Across 1880–2025 the Social Security Administration has recorded 10,281 people named Leonidas.
The Social Security Administration’s records begin in 1880, and Leonidas is already there in that first year — so the name is older than the record and these figures cannot date it. It has been recorded in 121 of the 146 years since.
The Social Security Administration has recorded 10,281 American births named Leonidas 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 9,650 are estimated to be alive today.
591 American babies were named Leonidas in 2025, ranking #1,027 that year.
Leonidas is rising. Across 2021–2025 it averaged 655 births a year, against 382 a year across 2011–2015 — a change of +72% 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 Leonidas is a boy’s name — 0.0% of the 10,281 Americans given it were girls and 100.0% were boys. In births since 2016 it is 0% girls and 100% 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 9,650 Americans named Leonidas are alive today — 94% of everyone ever recorded with the name. The median is 8 years old, and half are between 4 and 12. That is a narrow band because Leonidas 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 Leonidas on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org