Recorded 1968–2025 · United States
Cassidy was most popular in 1999, when 3,449 American babies were given the name — ranking #201 that year. In 2025 it ranked #998, with 609 births. Across 1880–2025 the Social Security Administration has recorded 64,583 people named Cassidy.
Cassidy first appears in Social Security Administration records in 1968, which makes it about 57 years old as a recorded American name. It has been recorded in 58 of the 58 years since.
The Social Security Administration has recorded 64,583 American births named Cassidy 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 63,698 are estimated to be alive today.
609 American babies were named Cassidy in 2025, ranking #998 that year.
Cassidy is falling. Across 2021–2025 it averaged 680 births a year, against 1,266 a year across 2011–2015 — a change of -46% 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 Cassidy is mostly a girl’s name — 94.2% of the 64,583 Americans given it were girls and 5.8% were boys. It changed hands: since 1975 it has gone mainly to girls, having gone mainly to boys before that. In births since 2016 it is 93% girls and 7% 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 63,698 Americans named Cassidy are alive today — 99% of everyone ever recorded with the name. The median is 25 years old, and half are between 17 and 30.
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 Cassidy on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org