Is Caio a boy or girl name?

Caio is a boy’s name. Of the 722 Americans recorded with the name since 1880, 0.0% were girls and 100.0% were boys.

Caio

Recorded 1990–2025 · United States

Caio was most popular in 2023, when 40 American babies were given the name — ranking #6,561 that year. In 2025 it ranked #7,111, with 35 births. Across 1880–2025 the Social Security Administration has recorded 722 people named Caio.

Caio over time

Births per year. The dot marks Caio’s peak in 2023. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Caio a boy’s or a girl’s name?

Across the whole record Caio is a boy’s name — 0.0% of the 722 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.

Names that peaked alongside Caio

Where Caio is most concentrated

How much more common the name is in each state than across the country as a whole.

Explore further

See Caio on the interactive charts

Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org