Cassius is an uncommon boys' name that has climbed to its highest level yet, peaking in 2021.
Cassius is predominantly a boy name. In 2025 it ranked #583 for boy births in the United States (and #1,162 across all names), given to 504 babies. Cassius first appears in 1880 and peaked in 2021 (607 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 504 | 504 | — | #583 |
| 2024 | 516 | 516 | — | #569 |
| 2023 | 514 | 514 | #15,656 | #576 |
| 2022 | 548 | 548 | #12,509 | #549 |
| 2021 | 612 | 612 | #15,733 | #487 |
| 2020 | 607 | 607 | #15,591 | #488 |
| 2019 | 554 | 554 | — | #514 |
| 2018 | 460 | 460 | — | #595 |
| 2017 | 475 | 475 | #11,873 | #582 |
| 2016 | 449 | 449 | — | #600 |
| 2015 | 406 | 406 | — | #644 |
| 2014 | 346 | 346 | — | #704 |
| 2013 | 300 | 300 | — | #757 |
| 2012 | 218 | 218 | — | #934 |
| 2011 | 240 | 240 | — | #873 |
| 2010 | 195 | 195 | — | #1,006 |
| 2009 | 199 | 199 | — | #993 |
| 2008 | 213 | 213 | — | #946 |
| 2007 | 164 | 164 | — | #1,115 |
| 2006 | 169 | 169 | — | #1,059 |
| 2005 | 102 | 102 | — | #1,443 |
| 2004 | 95 | 95 | — | #1,457 |
| 2003 | 79 | 79 | — | #1,597 |
| 2002 | 85 | 85 | — | #1,484 |
| 2001 | 59 | 59 | — | #1,875 |
| 2000 | 60 | 60 | — | #1,801 |
| 1999 | 47 | 47 | — | #2,031 |
| 1998 | 52 | 52 | — | #1,876 |
| 1997 | 45 | — | — | #1,994 |
| 1996 | 42 | — | — | #2,047 |
| 1995 | 34 | — | — | #2,302 |
| 1994 | 26 | — | — | #2,778 |
| 1993 | 42 | — | — | #1,942 |
| 1992 | 44 | — | — | #1,849 |
| 1991 | 45 | — | — | #1,774 |
| 1990 | 42 | — | — | #1,842 |
| 1989 | 25 | — | — | #2,549 |
| 1988 | 27 | — | — | #2,258 |
| 1987 | 23 | — | — | #2,406 |
| 1986 | 27 | — | — | #2,106 |
| 1985 | 16 | — | — | #2,963 |
| 1984 | 24 | — | — | #2,170 |
| 1983 | 19 | — | — | #2,504 |
| 1982 | 17 | — | — | #2,721 |
| 1981 | 22 | — | — | #2,279 |
| 1980 | 11 | — | — | #3,650 |
| 1979 | 16 | — | — | #2,790 |
| 1978 | 18 | — | — | #2,489 |
| 1977 | 13 | — | — | #3,066 |
| 1976 | 20 | — | — | #2,253 |
| 1975 | 11 | — | — | #3,275 |
| 1974 | 17 | — | — | #2,371 |
| 1973 | 12 | — | — | #2,874 |
| 1972 | 19 | — | — | #2,091 |
| 1971 | 36 | — | — | #1,418 |
| 1970 | 27 | — | — | #1,661 |
| 1969 | 22 | — | — | #1,772 |
| 1968 | 19 | — | — | #1,848 |
| 1967 | 43 | — | — | #1,136 |
| 1966 | 38 | — | — | #1,218 |
| 1965 | 42 | — | — | #1,167 |
| 1964 | 78 | — | — | #861 |
| 1963 | 27 | — | — | #1,514 |
| 1962 | 15 | — | — | #2,127 |
| 1961 | 17 | — | — | #2,003 |
| 1960 | 8 | — | — | #3,128 |
| 1959 | 9 | — | — | #2,852 |
| 1956 | 6 | — | — | #3,588 |
| 1955 | 8 | — | — | #3,002 |
| 1951 | 5 | — | — | #3,794 |
| 1950 | 6 | — | — | #3,372 |
| 1948 | 13 | — | — | #2,130 |
| 1946 | 5 | — | — | #3,595 |
| 1944 | 9 | — | — | #2,493 |
| 1943 | 10 | — | — | #2,427 |
| 1942 | 7 | — | — | #2,971 |
| 1941 | 7 | — | — | #2,911 |
| 1940 | 8 | — | — | #2,699 |
| 1939 | 6 | — | — | #3,167 |
| 1938 | 5 | — | — | #3,597 |
| 1935 | 6 | — | — | #3,316 |
| 1932 | 5 | — | — | #3,856 |
| 1931 | 13 | — | — | #2,113 |
| 1930 | 12 | — | — | #2,319 |
| 1929 | 10 | — | — | #2,624 |
| 1928 | 10 | — | — | #2,690 |
| 1927 | 8 | — | — | #3,203 |
| 1926 | 13 | — | — | #2,319 |
| 1925 | 10 | — | — | #2,779 |
| 1924 | 9 | — | — | #3,057 |
| 1923 | 16 | — | — | #2,034 |
| 1922 | 10 | — | — | #2,837 |
| 1921 | 10 | — | — | #2,836 |
| 1920 | 16 | — | — | #2,062 |
| 1919 | 8 | — | — | #3,155 |
| 1918 | 16 | — | — | #2,011 |
| 1917 | 17 | — | — | #1,827 |
| 1916 | 19 | — | — | #1,651 |
| 1915 | 10 | — | — | #2,480 |
| 1914 | 9 | — | — | #2,303 |
| 1913 | 11 | — | — | #1,693 |
| 1910 | 5 | — | — | #1,631 |
| 1908 | 5 | — | — | #1,411 |
| 1895 | 6 | — | — | #998 |
| 1893 | 8 | — | — | #779 |
| 1892 | 8 | — | — | #810 |
| 1891 | 6 | — | — | #862 |
| 1890 | 7 | — | — | #820 |
| 1889 | 6 | — | — | #892 |
| 1888 | 10 | — | — | #657 |
| 1887 | 5 | — | — | #952 |
| 1885 | 7 | — | — | #776 |
| 1884 | 6 | — | — | #872 |
| 1883 | 10 | — | — | #605 |
| 1882 | 12 | — | — | #546 |
| 1881 | 9 | — | — | #606 |
| 1880 | 17 | — | — | #430 |