In 2025, 80 US boys were named Cosmo, making it the 1,934th most common boys’ name of the year, down 246 places from #1,688 in 2024. That is 19 fewer than the 99 boys named Cosmo in 2024. Its best rank for boys was #933, reached in 1913. The most boys given the name in a single year was 99, in 2024. For comparison, it was #3,444 in 2015 and #1,896 in 1950.
Social Security card records list Cosmo in 116 years of the 146 from 1880 to 2025, starting in 1910 with 6 babies. In all, 2,955 US babies have been given the name, 0.2% of them girls and 99.7% boys. Its busiest decade was the 2020s, with 516 babies named Cosmo.
Over the 10 years from 2016 to 2025, 663 US boys were named Cosmo; the busiest of those years was 2024, with 99. In 2025 that was about 1 in 21,351 of the boys in SSA’s list for the year.
Among the states, Cosmo ranked highest in Pennsylvania in 2025, at #1,126 for boys there. It was not in the top 100 of any state. Rarer spellings such as Kosmo, Kozmo and Cozmo are summarised on this page.