Casimer is a rare boys' name that was most common in the 1910s and has all but disappeared.
Casimer is a boy name. It last appears in U.S. records in 2017. Casimer was first reported in SSA data in 1895 and peaked in 1918 (135 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2017 | 5 | 5 | #12,608 |
| 2009 | 5 | 5 | #12,784 |
| 1999 | 6 | 6 | #8,862 |
| 1980 | 6 | — | #5,619 |
| 1971 | 7 | — | #4,025 |
| 1969 | 6 | — | #4,004 |
| 1965 | 7 | — | #3,283 |
| 1964 | 5 | — | #4,130 |
| 1958 | 7 | — | #3,317 |
| 1957 | 9 | — | #2,849 |
| 1956 | 8 | — | #3,005 |
| 1955 | 8 | — | #3,000 |
| 1954 | 11 | — | #2,476 |
| 1953 | 8 | — | #2,939 |
| 1952 | 10 | — | #2,545 |
| 1951 | 8 | — | #2,870 |
| 1950 | 18 | — | #1,753 |
| 1949 | 12 | — | #2,242 |
| 1948 | 11 | — | #2,342 |
| 1947 | 16 | — | #1,930 |
| 1946 | 7 | — | #2,951 |
| 1945 | 14 | — | #1,862 |
| 1944 | 13 | — | #2,004 |
| 1943 | 19 | — | #1,646 |
| 1942 | 16 | — | #1,810 |
| 1941 | 15 | — | #1,829 |
| 1939 | 13 | — | #1,972 |
| 1938 | 9 | — | #2,509 |
| 1937 | 20 | — | #1,535 |
| 1936 | 13 | — | #1,971 |
| 1935 | 9 | — | #2,558 |
| 1934 | 12 | — | #2,148 |
| 1933 | 14 | — | #1,921 |
| 1932 | 26 | — | #1,360 |
| 1931 | 17 | — | #1,781 |
| 1930 | 25 | — | #1,467 |
| 1929 | 30 | — | #1,298 |
| 1928 | 50 | — | #964 |
| 1927 | 35 | — | #1,231 |
| 1926 | 50 | — | #965 |
| 1925 | 57 | — | #891 |
| 1924 | 47 | — | #1,035 |
| 1923 | 84 | — | #706 |
| 1922 | 73 | — | #781 |
| 1921 | 102 | — | #632 |
| 1920 | 111 | — | #593 |
| 1919 | 94 | — | #625 |
| 1918 | 135 | — | #515 |
| 1917 | 127 | — | #510 |
| 1916 | 105 | — | #558 |
| 1915 | 102 | — | #558 |
| 1914 | 80 | — | #555 |
| 1913 | 50 | — | #629 |
| 1912 | 30 | — | #805 |
| 1911 | 25 | — | #611 |
| 1910 | 19 | — | #682 |
| 1909 | 14 | — | #765 |
| 1908 | 6 | — | #1,239 |
| 1907 | 10 | — | #880 |
| 1906 | 7 | — | #1,025 |
| 1905 | 8 | — | #939 |
| 1901 | 7 | — | #868 |
| 1900 | 9 | — | #914 |
| 1899 | 6 | — | #954 |
| 1895 | 7 | — | #890 |