Recorded 1880–2025 · United States
Isadore was most popular in 1916, when 285 American babies were given the name — ranking #677 that year. In 2025 it ranked #12,329, with 15 births. Across 1880–2025 the Social Security Administration has recorded 5,909 people named Isadore.
The Social Security Administration’s records begin in 1880, and Isadore 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 143 of the 146 years since.
The Social Security Administration has recorded 5,909 American births named Isadore 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 1,131 are estimated to be alive today.
15 American babies were named Isadore in 2025, ranking #12,329 that year.
Isadore is too rare for a direction to mean much. It averaged 16 births a year across 2021–2025 against 13 a year a decade earlier — at these counts a single baby moves the percentage, and any year under five births is withheld at source.
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 Isadore is a boy’s name — 3.3% of the 5,909 Americans given it were girls and 96.7% were boys. In births since 2016 it is 20% girls and 80% 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 1,131 Americans named Isadore are alive today — 19% of everyone ever recorded with the name. The median is 54 years old, and half are between 23 and 72. 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 Isadore on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org