Casmir
Casmir was given to 6 boys in 2025, #10,905 among boys’ names; 356 Americans have been recorded with it since 1913 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Casmir by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Casmir?
#10,905 among boys’ names, 2025
Casmir entered the boys’ rankings after 2015 and stood at #10,905 in 2025.
24 babies in 1918, the peak
Casmir peaked in 1918, when 24 boys were given it, #1,501 among boys’ names. The 6 births of 2025 are 25% of that peak.
Births by sex.
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 2025 | 6 | #10,905 | 3.5 |
| 2024 | 8 | #9,130 | 4.6 |
| 2023 | 8 | #9,056 | 4.7 |
| 2022 | 7 | #10,006 | 4.0 |
| 2021 | 10 | #7,701 | 5.7 |
| 2020 | 11 | #7,113 | 6.4 |
| 2019 | 6 | #11,010 | 3.3 |
| 2018 | 5 | #12,486 | 2.8 |
| 2008 | 5 | #12,827 | 2.5 |
| 2005 | 5 | #11,718 | 2.5 |
Every recorded year (36)
| Year | Births | Rank | Per million boys |
|---|---|---|---|
| 2003 | 5 | #11,135 | 2.5 |
| 1947 | 6 | #3,422 | 3.3 |
| 1944 | 5 | #3,497 | 3.7 |
| 1936 | 5 | #3,622 | 4.8 |
| 1934 | 5 | #3,749 | 4.8 |
| 1933 | 5 | #3,719 | 5.0 |
| 1932 | 8 | #2,885 | 7.7 |
| 1931 | 5 | #3,844 | 4.8 |
| 1930 | 8 | #3,058 | 7.3 |
| 1929 | 6 | #3,611 | 5.6 |
| 1928 | 8 | #3,115 | 7.2 |
| 1927 | 10 | #2,726 | 8.9 |
| 1926 | 16 | #1,993 | 14.4 |
| 1925 | 9 | #2,963 | 8.1 |
| 1924 | 6 | #3,945 | 5.3 |
| 1923 | 8 | #3,212 | 7.3 |
| 1922 | 12 | #2,509 | 11.0 |
| 1921 | 15 | #2,166 | 13.6 |
| 1920 | 12 | #2,477 | 11.3 |
| 1919 | 24 | #1,489 | 24.5 |
| 1918 | 24 | #1,501 | 23.7 |
| 1917 | 17 | #1,825 | 18.4 |
| 1916 | 12 | #2,283 | 13.5 |
| 1915 | 22 | #1,468 | 25.9 |
| 1914 | 12 | #1,885 | 18.3 |
| 1913 | 6 | #2,543 | 11.7 |
Ranks and shares: boys’ names in each year’s SSA file; share of all boys SSA recorded that year.
Is Casmir a boy’s or a girl’s name?
Of the 356 Americans recorded as Casmir, 4% are girls and 96% boys. In 2025 it went to 6 boys; SSA lists no girls with it that year (fewer than 5, or none).
Years with fewer than 20 babies given the name are left blank.
Girls and boys named Casmir: the SSA national file counts each sex separately.
How many people are named Casmir, and how old are they?
An estimated 98 Americans named Casmir and born in the U.S. are alive in 2026, too few to state an age range. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 245 people named Casmir (31 women and girls, 214 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 62 born in the U.S. The Census count is 4.0 times 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.
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).
Names spelled alike
Of these 7 names spelled alike, given to 7,949 babies since 1880, Casmir is the third most given (4.5% of them). In 2025 it was given to 6 of their 91 babies (6.6%), the second most given that year.
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 Casmir
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 Casmir and names like it
- Compare Casmir and CasimirBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1910sCasmir peaked in 1918.
- Pennsylvania’s most given namesThe state where SSA recorded the most babies named Casmir since 1910.
- The top names of 1918The year the most babies were named Casmir.
- Names starting with CMost given first.