The baby name Cosmo appears in baby name data for the United States from 1913 to 2024. It was most popular in 1921 with 44 babies given the name.
In the later years of this period, Cosmo has become less common than it once was.
| Year | Count |
|---|---|
| 1913 | 18 |
| 1914 | 11 |
| 1915 | 23 |
| 1916 | 14 |
| 1917 | 23 |
| 1918 | 23 |
| 1919 | 20 |
| 1920 | 31 |
| 1921 | 44 |
| 1922 | 19 |
| 1923 | 38 |
| 1924 | 33 |
| 1925 | 31 |
| 1926 | 38 |
| 1927 | 28 |
| 1928 | 31 |
| 1929 | 18 |
| 1930 | 35 |
| 1931 | 12 |
| 1932 | 21 |
| 1933 | 14 |
| 1934 | 10 |
| 1935 | 16 |
| 1936 | 15 |
| 1937 | 11 |
| 1938 | 17 |
| 1939 | 10 |
| 1940 | 6 |
| 1941 | 18 |
| 1942 | 19 |
| 1943 | 15 |
| 1944 | 11 |
| 1946 | 5 |
| 1947 | 13 |
| 1948 | 11 |
| 1949 | 7 |
| 1950 | 8 |
| 1951 | 12 |
| 1952 | 11 |
| 1953 | 10 |
| 1954 | 8 |
| 1955 | 5 |
| 1956 | 13 |
| 1957 | 7 |
| 1958 | 9 |
| 1959 | 7 |
| 1960 | 7 |
| 1961 | 8 |
| 1963 | 6 |
| 1969 | 6 |
| 1970 | 5 |
| 1972 | 5 |
| 1973 | 5 |
| 1974 | 5 |
| 1975 | 5 |
| 1994 | 5 |
| 2002 | 6 |
| 2005 | 10 |
| 2006 | 5 |
| 2007 | 5 |
| 2009 | 5 |
| 2017 | 5 |
| 2020 | 11 |
| 2021 | 15 |
| 2022 | 35 |
| 2023 | 28 |
| 2024 | 31 |