Recorded 1951–2025 · United States
Declan was most popular in 2019, when 4,007 American babies were given the name — ranking #159 that year. In 2025 it ranked #251, with 2,587 births. Across 1880–2025 the Social Security Administration has recorded 58,950 people named Declan.
Declan first appears in Social Security Administration records in 1951, which makes it about 74 years old as a recorded American name. It has been recorded in 68 of the 75 years since.
The Social Security Administration has recorded 58,950 American births named Declan 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 58,400 are estimated to be alive today.
2,587 American babies were named Declan in 2025, ranking #251 that year.
Declan is holding steady. Across 2021–2025 it averaged 3,054 births a year, against 3,013 a year across 2011–2015 — a change of +1% 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 Declan is a boy’s name — 0.7% of the 58,950 Americans given it were girls and 99.3% were boys. In births since 2016 it is 1% girls and 99% 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 58,400 Americans named Declan are alive today — 99% of everyone ever recorded with the name. The median is 9 years old, and half are between 5 and 14. That is a narrow band because Declan 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 Declan on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org