Casmir is a rare variant of Casimir that peaked in 1918 and has grown less common since.
Casmir is predominantly a boy name. In 2025 it ranked #10,909 for boy births in the United States (and #22,521 across all names), given to 6 babies. Casmir was first reported in SSA data in 1913 and peaked in 1918 (24 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 6 | 6 | — | #10,909 |
| 2024 | 8 | 8 | — | #9,135 |
| 2023 | 8 | 8 | — | #9,061 |
| 2022 | 7 | 7 | — | #10,012 |
| 2021 | 10 | 10 | — | #7,706 |
| 2020 | 11 | 11 | — | #7,118 |
| 2019 | 6 | 6 | — | #11,015 |
| 2018 | 5 | 5 | — | #12,492 |
| 2008 | 5 | 5 | — | #12,834 |
| 2005 | 5 | 5 | — | #11,726 |
| 2003 | 5 | 5 | — | #11,143 |
| 1995 | 9 | — | #8,896 | — |
| 1994 | 5 | — | #13,786 | — |
| 1947 | 6 | — | — | #3,424 |
| 1944 | 5 | — | — | #3,499 |
| 1936 | 5 | — | — | #3,623 |
| 1934 | 5 | — | — | #3,751 |
| 1933 | 5 | — | — | #3,721 |
| 1932 | 8 | — | — | #2,885 |
| 1931 | 5 | — | — | #3,846 |
| 1930 | 8 | — | — | #3,060 |
| 1929 | 6 | — | — | #3,613 |
| 1928 | 8 | — | — | #3,117 |
| 1927 | 10 | — | — | #2,727 |
| 1926 | 16 | — | — | #1,993 |
| 1925 | 9 | — | — | #2,965 |
| 1924 | 6 | — | — | #3,947 |
| 1923 | 8 | — | — | #3,214 |
| 1922 | 12 | — | — | #2,510 |
| 1921 | 15 | — | — | #2,167 |
| 1920 | 12 | — | — | #2,478 |
| 1919 | 24 | — | — | #1,490 |
| 1918 | 24 | — | — | #1,502 |
| 1917 | 17 | — | — | #1,826 |
| 1916 | 12 | — | — | #2,284 |
| 1915 | 22 | — | — | #1,469 |
| 1914 | 12 | — | — | #1,886 |
| 1913 | 6 | — | — | #2,544 |