Recorded 1991–2025 · United States
Oisin was most popular in 2020, when 31 American babies were given the name — ranking #7,571 that year. In 2025 it ranked #9,648, with 22 births. Across 1880–2025 the Social Security Administration has recorded 513 people named Oisin.
Oisin first appears in Social Security Administration records in 1991, which makes it about 34 years old as a recorded American name. It has been recorded in 31 of the 35 years since.
The Social Security Administration has recorded 513 American births named Oisin 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 507 are estimated to be alive today.
22 American babies were named Oisin in 2025, ranking #9,648 that year.
Oisin is rising. Across 2021–2025 it averaged 25 births a year, against 16 a year across 2011–2015 — a change of +57% 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 Oisin is a boy’s name — 0.0% of the 513 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 507 Americans named Oisin are alive today — 99% of everyone ever recorded with the name. The median is 11 years old, and half are between 6 and 20.
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.
See Oisin on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org