The baby name Cleo appears in baby name data for the United States from 1910 to 2024. It was most popular in 1916 with 1,441 babies given the name.
In the later years of this period, Cleo has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 546 |
| 1910 | 40 |
| 1911 | 544 |
| 1911 | 48 |
| 1912 | 647 |
| 1912 | 130 |
| 1913 | 731 |
| 1913 | 121 |
| 1914 | 910 |
| 1914 | 253 |
| 1915 | 1,308 |
| 1915 | 449 |
| 1916 | 1,441 |
| 1916 | 405 |
| 1917 | 1,426 |
| 1917 | 401 |
| 1918 | 1,436 |
| 1918 | 461 |
| 1919 | 1,334 |
| 1919 | 463 |
| 1920 | 1,355 |
| 1920 | 456 |
| 1921 | 1,291 |
| 1921 | 445 |
| 1922 | 1,236 |
| 1922 | 399 |
| 1923 | 1,039 |
| 1923 | 394 |
| 1924 | 1,088 |
| 1924 | 396 |
| 1925 | 1,276 |
| 1925 | 379 |
| 1926 | 1,123 |
| 1926 | 351 |
| 1927 | 1,040 |
| 1927 | 422 |
| 1928 | 939 |
| 1928 | 272 |
| 1929 | 853 |
| 1929 | 271 |
| 1930 | 736 |
| 1930 | 269 |
| 1931 | 697 |
| 1931 | 264 |
| 1932 | 658 |
| 1932 | 247 |
| 1933 | 590 |
| 1933 | 258 |
| 1934 | 567 |
| 1934 | 228 |
| 1935 | 655 |
| 1935 | 179 |
| 1936 | 427 |
| 1936 | 212 |
| 1937 | 481 |
| 1937 | 176 |
| 1938 | 468 |
| 1938 | 176 |
| 1939 | 367 |
| 1939 | 138 |
| 1940 | 326 |
| 1940 | 126 |
| 1941 | 269 |
| 1941 | 129 |
| 1942 | 264 |
| 1942 | 148 |
| 1943 | 265 |
| 1943 | 107 |
| 1944 | 173 |
| 1944 | 99 |
| 1945 | 144 |
| 1945 | 96 |
| 1946 | 176 |
| 1946 | 105 |
| 1947 | 197 |
| 1947 | 136 |
| 1948 | 100 |
| 1948 | 73 |
| 1949 | 116 |
| 1949 | 85 |
| 1950 | 118 |
| 1950 | 84 |
| 1951 | 83 |
| 1951 | 50 |
| 1952 | 139 |
| 1952 | 59 |
| 1953 | 69 |
| 1953 | 67 |
| 1954 | 79 |
| 1954 | 25 |
| 1955 | 105 |
| 1955 | 84 |
| 1956 | 102 |
| 1956 | 66 |
| 1957 | 34 |
| 1957 | 51 |
| 1958 | 66 |
| 1958 | 36 |
| 1959 | 30 |
| 1959 | 10 |
| 1960 | 34 |
| 1960 | 10 |
| 1961 | 9 |
| 1961 | 12 |
| 1962 | 39 |
| 1963 | 15 |
| 1964 | 35 |
| 1965 | 12 |
| 1965 | 14 |
| 1966 | 20 |
| 1966 | 12 |
| 1967 | 6 |
| 1967 | 6 |
| 1969 | 5 |
| 1973 | 5 |
| 1974 | 5 |
| 1975 | 10 |
| 1977 | 15 |
| 1978 | 6 |
| 1979 | 15 |
| 1983 | 5 |
| 1985 | 16 |
| 1989 | 5 |
| 1990 | 5 |
| 1992 | 8 |
| 1995 | 5 |
| 1997 | 8 |
| 1998 | 7 |
| 2001 | 27 |
| 2002 | 6 |
| 2003 | 12 |
| 2004 | 16 |
| 2005 | 17 |
| 2007 | 17 |
| 2008 | 10 |
| 2009 | 18 |
| 2010 | 17 |
| 2011 | 45 |
| 2012 | 43 |
| 2013 | 16 |
| 2014 | 44 |
| 2015 | 49 |
| 2016 | 103 |
| 2017 | 96 |
| 2018 | 133 |
| 2019 | 196 |
| 2020 | 273 |
| 2021 | 318 |
| 2022 | 416 |
| 2023 | 475 |
| 2024 | 480 |