Casimir
Casimir was the 2039th most popular name for boys in 2025, given to 73 babies. Its best year was 1917, when it ranked 393rd; the most babies were born in 1919 (220). Over the last ten years it has moved up 1,268 places. More babies were named Casimir in the 1920s than in any other decade.
Meaning Not yet researched how we research meanings
- Rank in 2025
- #2,039 boys, up 1,623 places since 2020
- Babies in 2025
- 73boys
- Girls and boys
- Almost always a boy’s name2021–2025
- Peak year
- 1919220 babies
- Total since 1880
- 5,248babies recorded
Casimir popularity since 1880
| Year | Rank (boys) | Babies (boys) |
|---|---|---|
| 2025 | #2,039 | 73 |
| 2020 | #3,662 | 29 |
| 2010 | #4,128 | 24 |
| 2000 | #4,612 | 16 |
| 1990 | #3,073 | 20 |
| 1980 | #2,848 | 16 |
| 1970 | #2,916 | 11 |
| 1960 | #2,051 | 16 |
| 1950 | #1,222 | 35 |
| 1940 | #1,093 | 36 |
| 1930 | #635 | 93 |
| 1920 | #413 | 206 |
| 1910 | #732 | 17 |
| 1900 | #1,063 | 7 |
| 1890 | — | — |
| 1880 | — | — |
How popular is Casimir, counting every spelling?
Casimir is the most common spelling of a name family that ranked #1,446 for boys in 2025 once every spelling is counted together, compared with #2,039 for Casimir on its own. Together these spellings went to 113 boys in 2025.
| Spelling | Babies 2025 | Official rank | Babies 2021–2025 |
|---|---|---|---|
| Casimir | 73 | #2,039 | 288 |
| Kazimir | 29 | #3,811 | 176 |
| Kasimir | 6 | #11,344 | 40 |
Spellings count together when they sound the same in American English and are used for the same sex; nicknames and forms that sound different (such as Theo and Theodore) are kept apart. How we group spellings.
How many kids will share the name Casimir?
73 of the 3,606,400 babies born in the US in 2025 were named Casimir (0.02 per 1,000 births). For a boy named Casimir born in 2025, the chance that another child with the same name is in a class of 20 children the same age is under 1 in 50. If every grade liked the name as much as the 2025 babies do, only about one elementary school in 115 (of 430 pupils) would have a child named Casimir.
Shares of all registered births (NCHS); classes assumed to be children born the same year. How we estimate this.
How old are people named Casimir?
About 1,600 people born in the US named Casimir are alive today, with a median age of 27; half are between 10 and 63. That makes Casimir mostly worn by children and young adults. The wide spread shows a name popular in two different eras.
Babies given the name each year (SSA) times the share of that birth year still alive (SSA life tables). Counts people born in the US only. Method.
Casimir by state
How common Casimir was among boys born in each state in 2021–2025. In 44 states fewer than five boys a year got the name, too few for SSA to publish, so those states show as zero.
Names with a similar history
These names rose and fell in step with Casimir: their share of US boys followed the most similar curve since 1880. If you like Casimir, they share its era and feel.
Questions about the name Casimir
How popular is the name Casimir?
Casimir was the 2039th most popular name for boys in 2025, given to 73 babies. Its best year was 1917, when it ranked 393rd; the most babies were born in 1919 (220). Over the last ten years it has moved up 1,268 places. More babies were named Casimir in the 1920s than in any other decade.
Is Casimir a boy or girl name?
In 2021–2025, almost always a boy’s name given the name Casimir in the US.
Where is Casimir most popular?
In 2021–2025, Casimir was most common in Minnesota (0.04 per 1,000 boys), followed by Pennsylvania and Colorado.