The baby name Casimir appears in baby name data for the United States from 1910 to 2023. It was most popular in 1919 with 277 babies given the name.
In the later years of this period, Casimir has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 5 |
| 1911 | 31 |
| 1912 | 75 |
| 1913 | 112 |
| 1914 | 117 |
| 1915 | 230 |
| 1916 | 218 |
| 1917 | 261 |
| 1918 | 235 |
| 1919 | 277 |
| 1920 | 249 |
| 1921 | 227 |
| 1922 | 218 |
| 1923 | 180 |
| 1924 | 207 |
| 1925 | 146 |
| 1926 | 129 |
| 1927 | 107 |
| 1928 | 120 |
| 1929 | 98 |
| 1930 | 103 |
| 1931 | 100 |
| 1932 | 80 |
| 1933 | 96 |
| 1934 | 65 |
| 1935 | 47 |
| 1936 | 41 |
| 1937 | 50 |
| 1938 | 47 |
| 1939 | 33 |
| 1940 | 41 |
| 1941 | 24 |
| 1942 | 49 |
| 1943 | 39 |
| 1944 | 33 |
| 1945 | 21 |
| 1946 | 22 |
| 1948 | 34 |
| 1949 | 23 |
| 1950 | 28 |
| 1951 | 28 |
| 1952 | 22 |
| 1953 | 22 |
| 1954 | 30 |
| 1955 | 20 |
| 1956 | 12 |
| 1958 | 10 |
| 1961 | 15 |
| 1980 | 21 |
| 1981 | 15 |
| 2004 | 5 |
| 2005 | 10 |
| 2011 | 5 |
| 2012 | 5 |
| 2013 | 5 |
| 2021 | 5 |
| 2022 | 21 |
| 2023 | 6 |