Casimir
Casimir was given to 73 boys in 2025, #2,039 among boys’ names; 5,248 Americans have been recorded with it since 1894 (Social Security Administration, published May 2026).
An estimated 1,610 Americans named Casimir and born in the U.S. are alive in 2026 (31% of everyone recorded); the median is 27 years old and half are between 10 and 63.
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Casimir by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
What does Casimir mean?
Wiktionary, English section
Casimir is “a male given name from Polish.” Its etymology gives the sense “proclamation of peace” (meaning).
From a Polish royal name and saint’s name Kazimierz, of Slavic origin, meaning “proclamation of peace”.
/ˈkæzɪmɪɚ/
Meaning: Wiktionary, English section, as of Sep 25, 2026 (CC BY‑SA 4.0).
How popular is Casimir?
#2,039 among boys’ names, 2025
Casimir rose from #3,306 in 2015 to #2,039 in 2025 among boys’ names; its share of boys born rose from 17.7 to 42.7 per million.
220 babies in 1919, the peak
Casimir peaked in 1919, when 220 boys were given it, #395 among boys’ names. The 73 births of 2025 are 33% of that peak.
| Year | Births | Rank | Per 1,000 boys |
|---|---|---|---|
| 2025 | 73 | #2,039 | 0.04 |
| 2024 | 59 | #2,377 | 0.03 |
| 2023 | 58 | #2,362 | 0.03 |
| 2022 | 58 | #2,413 | 0.03 |
| 2021 | 40 | #3,028 | 0.02 |
| 2020 | 29 | #3,659 | 0.02 |
| 2019 | 29 | #3,730 | 0.02 |
| 2018 | 31 | #3,542 | 0.02 |
| 2017 | 24 | #4,240 | 0.01 |
| 2016 | 29 | #3,699 | 0.02 |
Every recorded year (131)
| Year | Births | Rank | Per 1,000 boys |
|---|---|---|---|
| 2015 | 34 | #3,306 | 0.02 |
| 2014 | 31 | #3,465 | 0.02 |
| 2013 | 37 | #3,008 | 0.02 |
| 2012 | 23 | #4,271 | 0.01 |
| 2011 | 22 | #4,387 | 0.01 |
| 2010 | 24 | #4,127 | 0.01 |
| 2009 | 22 | #4,453 | 0.01 |
| 2008 | 28 | #3,751 | 0.01 |
| 2007 | 25 | #4,025 | 0.01 |
| 2006 | 15 | #5,555 | 0.01 |
| 2005 | 23 | #3,957 | 0.01 |
| 2004 | 23 | #3,879 | 0.01 |
| 2003 | 14 | #5,304 | 0.01 |
| 2002 | 23 | #3,680 | 0.01 |
| 2001 | 11 | #6,073 | 0.01 |
| 2000 | 16 | #4,605 | 0.01 |
| 1999 | 13 | #5,069 | 0.01 |
| 1998 | 14 | #4,678 | 0.01 |
| 1997 | 19 | #3,611 | 0.01 |
| 1996 | 10 | #5,586 | 0.01 |
| 1995 | 10 | #5,548 | 0.01 |
| 1994 | 12 | #4,831 | 0.01 |
| 1993 | 13 | #4,471 | 0.01 |
| 1992 | 17 | #3,622 | 0.01 |
| 1991 | 9 | #5,570 | under 0.01 |
| 1990 | 20 | #3,067 | 0.01 |
| 1989 | 17 | #3,333 | 0.01 |
| 1988 | 11 | #4,191 | 0.01 |
| 1987 | 11 | #4,000 | 0.01 |
| 1986 | 6 | #6,040 | under 0.01 |
| 1985 | 15 | #3,090 | 0.01 |
| 1984 | 17 | #2,714 | 0.01 |
| 1983 | 10 | #3,918 | 0.01 |
| 1982 | 15 | #2,987 | 0.01 |
| 1981 | 14 | #3,051 | 0.01 |
| 1980 | 16 | #2,847 | 0.01 |
| 1979 | 10 | #3,840 | 0.01 |
| 1978 | 9 | #3,899 | 0.01 |
| 1977 | 13 | #3,064 | 0.01 |
| 1976 | 9 | #3,754 | 0.01 |
| 1975 | 5 | #5,580 | under 0.01 |
| 1974 | 12 | #2,973 | 0.01 |
| 1973 | 10 | #3,260 | 0.01 |
| 1972 | 10 | #3,187 | 0.01 |
| 1971 | 10 | #3,178 | 0.01 |
| 1970 | 11 | #2,914 | 0.01 |
| 1969 | 10 | #2,889 | 0.01 |
| 1968 | 18 | #1,899 | 0.01 |
| 1967 | 11 | #2,493 | 0.01 |
| 1966 | 7 | #3,282 | under 0.01 |
| 1965 | 15 | #2,098 | 0.01 |
| 1964 | 12 | #2,432 | 0.01 |
| 1963 | 16 | #2,050 | 0.01 |
| 1962 | 11 | #2,529 | 0.01 |
| 1961 | 17 | #2,001 | 0.01 |
| 1960 | 16 | #2,050 | 0.01 |
| 1959 | 13 | #2,314 | 0.01 |
| 1958 | 22 | #1,685 | 0.01 |
| 1957 | 15 | #2,104 | 0.01 |
| 1956 | 18 | #1,896 | 0.01 |
| 1955 | 24 | #1,573 | 0.01 |
| 1954 | 30 | #1,385 | 0.01 |
| 1953 | 35 | #1,261 | 0.02 |
| 1952 | 31 | #1,351 | 0.02 |
| 1951 | 29 | #1,380 | 0.02 |
| 1950 | 35 | #1,221 | 0.02 |
| 1949 | 29 | #1,349 | 0.02 |
| 1948 | 30 | #1,325 | 0.02 |
| 1947 | 23 | #1,561 | 0.01 |
| 1946 | 27 | #1,356 | 0.02 |
| 1945 | 38 | #1,040 | 0.03 |
| 1944 | 29 | #1,237 | 0.02 |
| 1943 | 37 | #1,120 | 0.03 |
| 1942 | 44 | #1,010 | 0.03 |
| 1941 | 32 | #1,171 | 0.03 |
| 1940 | 36 | #1,093 | 0.03 |
| 1939 | 31 | #1,172 | 0.03 |
| 1938 | 42 | #980 | 0.04 |
| 1937 | 42 | #968 | 0.04 |
| 1936 | 39 | #1,014 | 0.04 |
| 1935 | 46 | #931 | 0.04 |
| 1934 | 51 | #881 | 0.05 |
| 1933 | 74 | #696 | 0.07 |
| 1932 | 56 | #855 | 0.05 |
| 1931 | 72 | #721 | 0.07 |
| 1930 | 93 | #635 | 0.08 |
| 1929 | 88 | #657 | 0.08 |
| 1928 | 98 | #618 | 0.09 |
| 1927 | 104 | #611 | 0.09 |
| 1926 | 114 | #582 | 0.10 |
| 1925 | 123 | #558 | 0.11 |
| 1924 | 163 | #485 | 0.14 |
| 1923 | 152 | #497 | 0.14 |
| 1922 | 168 | #477 | 0.15 |
| 1921 | 188 | #449 | 0.17 |
| 1920 | 206 | #413 | 0.19 |
| 1919 | 220 | #395 | 0.22 |
| 1918 | 179 | #444 | 0.18 |
| 1917 | 205 | #393 | 0.22 |
| 1916 | 181 | #414 | 0.20 |
| 1915 | 178 | #403 | 0.21 |
| 1914 | 106 | #469 | 0.16 |
| 1913 | 95 | #437 | 0.19 |
| 1912 | 67 | #481 | 0.16 |
| 1911 | 29 | #562 | 0.13 |
| 1910 | 17 | #732 | 0.09 |
| 1909 | 16 | #686 | 0.10 |
| 1908 | 24 | #514 | 0.16 |
| 1907 | 12 | #779 | 0.08 |
| 1906 | 13 | #682 | 0.10 |
| 1905 | 12 | #706 | 0.09 |
| 1904 | 6 | #1,084 | 0.05 |
| 1903 | 6 | #1,032 | 0.05 |
| 1902 | 8 | #873 | 0.07 |
| 1901 | 7 | #868 | 0.07 |
| 1900 | 7 | #1,062 | 0.05 |
| 1899 | 7 | #871 | 0.07 |
| 1897 | 5 | #1,090 | 0.04 |
| 1896 | 8 | #837 | 0.07 |
| 1895 | 6 | #996 | 0.05 |
| 1894 | 5 | #1,107 | 0.04 |
Ranks and shares: boys’ names in each year’s SSA file; share of all boys SSA recorded that year.
Is Casimir a boy’s or a girl’s name?
Casimir has been recorded only for boys: SSA lists no girls with the name in 131 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Casimir: the SSA national file counts each sex separately.
How many people are named Casimir, and how old are they?
1,610 alive in 2026, estimated
That is 31% of the 5,248 Americans ever recorded as Casimir. The median Casimir alive today is 27 years old; half are between 10 and 63.
The 2020 Census counted 1,712 people named Casimir (34 women and girls, 1,678 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 1,519 born in the U.S. The Census count is 13% above that prediction. Possible reasons: the Census counts people born abroad, whom SSA’s files leave out, and it records the name people give, which SSA may have recorded under another spelling or as part of a compound name.
Alive today, by age
Alive today, by generation
| Generation | Born | Alive |
|---|---|---|
| Silent Generation | 1928-1945 | 140 |
| Baby Boomers | 1946-1964 | 275 |
| Generation X | 1965-1980 | 155 |
| Millennials | 1981-1996 | 196 |
| Generation Z | 1997-2012 | 310 |
| Generation Alpha | 2013-2025 | 528 |
An estimate, not a count. SSA’s files count people born in the United States who received a Social Security number, so anyone born abroad is not in them; before 1937 most people got a number as adults, and their survival is counted from that age.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Where are babies named Casimir born?
The states with the most babies named Casimir are Illinois, New York and Pennsylvania, with 64% of its births recorded by state since 1910.
| State | Since 1910 | Rank, boys | vs. national |
|---|---|---|---|
| Illinois | 1,078 | not ranked | 3.9× |
| New York | 493 | #1,322 | 1.1× |
| Pennsylvania | 429 | #1,268 | 1.1× |
| Michigan | 333 | not ranked | 1.8× |
| New Jersey | 193 | not ranked | 1.2× |
| Ohio | 180 | not ranked | 0.7× |
| Wisconsin | 177 | not ranked | 1.5× |
| Indiana | 90 | not ranked | 0.7× |
| Massachusetts | 75 | not ranked | 0.4× |
| Connecticut | 32 | not ranked | 0.5× |
Where Casimir is more common than its national share predicts
Relative to its national share, Casimir is most over-represented in Illinois: since 1910 it was given 3.9 times as often there as its national share each year would predict.
States: SSA state file, 1910-2025, published May 8, 2026; births count girls and boys together, and the rank is among boys’ names in the state in 2025. The file leaves out any state and year with fewer than 5 babies of the name, so small states are undercounted; each ratio compares the state’s births of Casimir with the births its national share predicts year by year, for states with at least 100 births of the name.
Names spelled alike
Of these 7 names spelled alike, given to 7,949 babies since 1880, Casimir is the most given (66% of them). In 2025 it was given to 73 of their 91 babies (80%), again the most given.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Casimir
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Casimir and names like it
- Compare Casimir and CasimerBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1910sCasimir peaked in 1919.
- Illinois’s most given namesThe state where SSA recorded the most babies named Casimir since 1910.
- Polish namesWiktionary’s origin for Casimir: every such name, by how often it is given.
- The top names of 1919The year the most babies were named Casimir.
- The names of Generation AlphaMost people named Casimir alive today were born 2013-2025.
- Names starting with CMost given first.