Casimiro is a rare variant of Casimir that peaked in 1921 and has since faded.
Casimiro is a boy name. In 2025 it ranked #10,908 for boy births in the United States (and #22,520 across all names), given to 6 babies. Casimiro was first reported in SSA data in 1881 and peaked in 1921 (28 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 6 | 6 | #10,908 |
| 2023 | 5 | 5 | #12,546 |
| 2022 | 7 | 7 | #10,011 |
| 2021 | 9 | 9 | #8,290 |
| 2019 | 8 | 8 | #9,040 |
| 2018 | 5 | 5 | #12,489 |
| 2017 | 6 | 6 | #11,007 |
| 2016 | 8 | 8 | #8,987 |
| 2009 | 9 | 9 | #8,410 |
| 2008 | 5 | 5 | #12,832 |
| 2006 | 6 | 6 | #10,885 |
| 2005 | 8 | 8 | #8,416 |
| 2004 | 10 | 10 | #7,049 |
| 2003 | 8 | 8 | #7,960 |
| 2002 | 6 | 6 | #9,564 |
| 2001 | 10 | 10 | #6,529 |
| 2000 | 12 | 12 | #5,627 |
| 1999 | 5 | 5 | #10,133 |
| 1998 | 7 | 7 | #7,683 |
| 1996 | 10 | — | #5,594 |
| 1995 | 9 | — | #5,992 |
| 1994 | 6 | — | #7,919 |
| 1993 | 9 | — | #5,827 |
| 1992 | 10 | — | #5,285 |
| 1991 | 10 | — | #5,145 |
| 1990 | 7 | — | #6,508 |
| 1989 | 13 | — | #4,054 |
| 1988 | 7 | — | #5,850 |
| 1987 | 12 | — | #3,756 |
| 1986 | 11 | — | #3,916 |
| 1985 | 16 | — | #2,961 |
| 1984 | 10 | — | #3,960 |
| 1983 | 9 | — | #4,181 |
| 1982 | 10 | — | #4,000 |
| 1981 | 9 | — | #4,198 |
| 1980 | 6 | — | #5,620 |
| 1979 | 9 | — | #4,123 |
| 1978 | 9 | — | #3,902 |
| 1977 | 6 | — | #5,222 |
| 1976 | 13 | — | #2,965 |
| 1975 | 13 | — | #2,922 |
| 1974 | 11 | — | #3,162 |
| 1973 | 15 | — | #2,521 |
| 1972 | 6 | — | #4,511 |
| 1971 | 13 | — | #2,698 |
| 1970 | 9 | — | #3,313 |
| 1969 | 6 | — | #4,005 |
| 1968 | 10 | — | #2,756 |
| 1967 | 14 | — | #2,152 |
| 1966 | 15 | — | #2,055 |
| 1965 | 8 | — | #3,016 |
| 1964 | 11 | — | #2,558 |
| 1963 | 10 | — | #2,696 |
| 1962 | 8 | — | #3,079 |
| 1961 | 10 | — | #2,737 |
| 1960 | 6 | — | #3,716 |
| 1959 | 11 | — | #2,552 |
| 1958 | 7 | — | #3,318 |
| 1957 | 13 | — | #2,290 |
| 1956 | 14 | — | #2,175 |
| 1955 | 8 | — | #3,001 |
| 1954 | 13 | — | #2,220 |
| 1953 | 19 | — | #1,773 |
| 1952 | 10 | — | #2,546 |
| 1951 | 12 | — | #2,268 |
| 1950 | 8 | — | #2,800 |
| 1949 | 7 | — | #3,065 |
| 1948 | 13 | — | #2,129 |
| 1947 | 18 | — | #1,794 |
| 1946 | 10 | — | #2,421 |
| 1945 | 6 | — | #3,033 |
| 1944 | 7 | — | #2,901 |
| 1943 | 7 | — | #2,998 |
| 1942 | 8 | — | #2,743 |
| 1941 | 12 | — | #2,097 |
| 1940 | 8 | — | #2,698 |
| 1939 | 11 | — | #2,183 |
| 1938 | 5 | — | #3,595 |
| 1937 | 20 | — | #1,536 |
| 1936 | 9 | — | #2,480 |
| 1935 | 11 | — | #2,270 |
| 1934 | 12 | — | #2,149 |
| 1933 | 11 | — | #2,232 |
| 1931 | 18 | — | #1,705 |
| 1930 | 16 | — | #1,901 |
| 1929 | 21 | — | #1,623 |
| 1928 | 18 | — | #1,839 |
| 1927 | 13 | — | #2,313 |
| 1926 | 22 | — | #1,617 |
| 1925 | 12 | — | #2,457 |
| 1924 | 16 | — | #2,060 |
| 1923 | 13 | — | #2,351 |
| 1922 | 14 | — | #2,259 |
| 1921 | 28 | — | #1,418 |
| 1920 | 13 | — | #2,355 |
| 1919 | 14 | — | #2,168 |
| 1918 | 12 | — | #2,420 |
| 1917 | 9 | — | #2,768 |
| 1916 | 10 | — | #2,577 |
| 1915 | 13 | — | #2,086 |
| 1914 | 10 | — | #2,125 |
| 1912 | 10 | — | #1,637 |
| 1881 | 6 | — | #803 |