Recorded 1915–2025 · United States
Brook was most popular in 1980, when 496 American babies were given the name — ranking #793 that year. In 2025 it ranked #5,826, with 47 births. Across 1880–2025 the Social Security Administration has recorded 14,021 people named Brook.
Brook first appears in Social Security Administration records in 1915, which makes it about 110 years old as a recorded American name. It has been recorded in 95 of the 111 years since.
The Social Security Administration has recorded 14,021 American births named Brook 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 13,315 are estimated to be alive today.
47 American babies were named Brook in 2025, ranking #5,826 that year.
Brook is falling. Across 2021–2025 it averaged 46 births a year, against 112 a year across 2011–2015 — a change of -59% 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 Brook is a unisex name — 75.8% of the 14,021 Americans given it were girls and 24.2% were boys. It changed hands: since 1972 it has gone mainly to girls, having gone mainly to boys before that. In births since 2016 it is 74% girls and 26% 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 13,315 Americans named Brook are alive today — 95% of everyone ever recorded with the name. The median is 36 years old, and half are between 26 and 48.
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 Brook on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org