Is Cosmo a boy or girl name?

Cosmo is a boy’s name. Of the 2,955 Americans recorded with the name since 1880, 0.2% were girls and 99.8% were boys.

Cosmo

Recorded 1910–2025 · United States

Cosmo was most popular in 2022, when 105 American babies were given the name — ranking #3,469 that year. In 2025 it ranked #4,107, with 80 births. Across 1880–2025 the Social Security Administration has recorded 2,955 people named Cosmo.

Cosmo over time

Births per year. The dot marks Cosmo’s peak in 2022. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Cosmo a boy’s or a girl’s name?

Across the whole record Cosmo is a boy’s name — 0.2% of the 2,955 Americans given it were girls and 99.8% were boys. In births since 2016 it is 1% girls and 99% 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 Cosmo

Where Cosmo is most concentrated

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

Explore further

See Cosmo on the interactive charts

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