Casimer Boy
How popular is Casimer?
Peaked in 1918
No babies were recorded with the name Casimer in 2025. It was most used in 1918, when 135 boys got the name.
197living people named Casimer (est.)
76median age of people named Casimer
1,895babies named Casimer since 1880
Casimer popularity over time
| Rank in 2025 | Not ranked |
|---|---|
| Babies in 2025 | 0 boys |
| 10-year trend | Not used lately |
| Peak year | 1918 (135 boys) |
| Highest rank | #509 in 1917 |
| First recorded | 1895 |
| Boys vs girls (last 10 years) | 100% boys, 0% girls |
Casimer counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Casimir family of names ranked #1,339 for boys in 2025 (#1,306 the year before), with 113 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Casimir | 73 | 65% |
| Kazimir | 29 | 26% |
| Kasimir | 6 | 5% |
| Cazimir | 5 | 4% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Casimer by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1890s | 13 | #871 |
| 1900s | 61 | #756 |
| 1910s | 767 | #509 |
| 1920s | 639 | #592 |
| 1930s | 158 | #1,356 |
| 1940s | 123 | #1,635 |
| 1950s | 87 | #1,745 |
| 1960s | 18 | #3,243 |
| 1970s | 7 | #3,961 |
| 1980s | 6 | #5,523 |
| 1990s | 6 | #8,697 |
| 2000s | 5 | #12,486 |
| 2010s | 5 | #12,241 |
Questions
- Is Casimer a boy or girl name?
- Casimer is mostly a boy name. Over the last 10 years, 100% of babies named Casimer were boys.
- How popular is the name Casimer?
- No babies were recorded with the name Casimer in 2025. It was most used in 1918, when 135 boys got the name.
- When was Casimer most popular?
- Casimer peaked in 1918, when 135 boys were given the name. Its highest rank was #509 in 1917.
- How many people are named Casimer?
- 1,895 babies have been named Casimer in the US since 1880. We estimate about 197 of them are alive in 2026, with a median age of 76.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.