Recorded 1880–2025 · United States
Duncan was most popular in 1997, when 644 American babies were given the name — ranking #780 that year. In 2025 it ranked #2,289, with 190 births. Across 1880–2025 the Social Security Administration has recorded 21,230 people named Duncan.
The Social Security Administration’s records begin in 1880, and Duncan 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 145 of the 146 years since.
The Social Security Administration has recorded 21,230 American births named Duncan 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 17,215 are estimated to be alive today.
190 American babies were named Duncan in 2025, ranking #2,289 that year.
Duncan is holding steady. Across 2021–2025 it averaged 220 births a year, against 277 a year across 2011–2015 — a change of -21% 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 Duncan is a boy’s name — 0.1% of the 21,230 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 17,215 Americans named Duncan are alive today — 81% of everyone ever recorded with the name. The median is 28 years old, and half are between 18 and 42.
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 Duncan on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org