Cosmo has been given to about 2,955 people in the United States since 1880. It was most common in 2022, which makes it a current name.
Its best year was 2022, when 105 babies were given the name, ranking 1708th. The typical living American called Cosmo is about 24 years old today. It is relatively most common in Pennsylvania, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.