Recorded 1994–2025 · United States
Caius was most popular in 2025, when 254 American babies were given the name — ranking #1,896 that year. In 2025 it ranked #1,896, with 254 births. Across 1880–2025 the Social Security Administration has recorded 2,329 people named Caius.
Caius first appears in Social Security Administration records in 1994, which makes it about 31 years old as a recorded American name. It has been recorded in 28 of the 32 years since.
The Social Security Administration has recorded 2,329 American births named Caius 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 2,310 are estimated to be alive today.
254 American babies were named Caius in 2025, ranking #1,896 that year.
Caius is rising. Across 2021–2025 it averaged 178 births a year, against 98 a year across 2011–2015 — a change of +82% 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 Caius is a boy’s name — 0.0% of the 2,329 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 2,310 Americans named Caius are alive today — 99% of everyone ever recorded with the name. The median is 7 years old, and half are between 3 and 12. That is a narrow band because Caius 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 Caius on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org