Cleo has been given to about 45,092 people in the United States since 1880. It was most common in 1920, which makes it a interwar name.
Cleo ranks 577th among American unisexs in 2025, with 534 born that year. Its best year was 1920, when 1,399 babies were given the name, ranking 191st. The typical living American called Cleo is about 70 years old today. It is relatively most common in Alaska, where it accounts for 0.13% 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.