Recorded 1942–2025 · United States
Cydney was most popular in 2000, when 230 American babies were given the name — ranking #1,657 that year. In 2025 it ranked #17,163, with 9 births. Across 1880–2025 the Social Security Administration has recorded 5,170 people named Cydney.
Cydney first appears in Social Security Administration records in 1942, which makes it about 83 years old as a recorded American name. It has been recorded in 80 of the 84 years since.
The Social Security Administration has recorded 5,170 American births named Cydney 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 4,987 are estimated to be alive today.
9 American babies were named Cydney in 2025, ranking #17,163 that year.
Cydney is falling. Across 2021–2025 it averaged 15 births a year, against 59 a year across 2011–2015 — a change of -74% 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 Cydney is a girl’s name — 99.5% of the 5,170 Americans given it were girls and 0.5% were boys. In births since 2016 it is 100% girls and 0% 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 4,987 Americans named Cydney are alive today — 96% of everyone ever recorded with the name. The median is 29 years old, and half are between 22 and 36.
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 Cydney on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org