Casimir Boy
How popular is Casimir?
#2,035 boy name in 2025
73 baby boys were named Casimir in the US in 2025, making it the 2035th most popular boy name.
Casimir popularity over time
| Rank in 2025 | #2,035 for boys (▲ 335 from 2024) |
|---|---|
| Babies in 2025 | 73 boys |
| 10-year trend | Rising fast (+115% babies vs 2015) |
| Earlier ranks | #3,298 in 2015, #3,650 in 2020 |
| Peak year | 1919 (220 boys) |
| Highest rank | #393 in 1917 |
| First recorded | 1894 |
| Boys vs girls (last 10 years) | 100% boys, 0% girls |
| Chance a classmate shares it | 0.1% in a class of 25 kids born in 2025 |
Casimir 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.
Where Casimir is most popular
Babies named Casimir per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- Pennsylvania: 0.0 per 1,000 (11 boys)
- Minnesota: 0.0 per 1,000 (5 boys)
- Colorado: 0.0 per 1,000 (5 boys)
- New York: 0.0 per 1,000 (13 boys)
- Georgia: 0.0 per 1,000 (5 boys)
Casimir by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1890s | 31 | #825 |
| 1900s | 111 | #513 |
| 1910s | 1,277 | #393 |
| 1920s | 1,404 | #413 |
| 1930s | 546 | #634 |
| 1940s | 325 | #1,007 |
| 1950s | 252 | #1,219 |
| 1960s | 133 | #1,893 |
| 1970s | 99 | #2,890 |
| 1980s | 132 | #2,705 |
| 1990s | 137 | #3,052 |
| 2000s | 200 | #3,665 |
| 2010s | 284 | #2,996 |
| 2020s | 317 | #2,035 |
Boy names about as popular as Casimir
Questions
- Is Casimir a boy or girl name?
- Casimir is mostly a boy name. Over the last 10 years, 100% of babies named Casimir were boys.
- How popular is the name Casimir?
- 73 baby boys were named Casimir in the US in 2025, making it the 2035th most popular boy name.
- When was Casimir most popular?
- Casimir peaked in 1919, when 220 boys were given the name. Its highest rank was #393 in 1917.
- How many people are named Casimir?
- 5,248 babies have been named Casimir in the US since 1880. We estimate about 1,684 of them are alive in 2026, with a median age of 30.
- Where is Casimir most popular?
- From 2021 to 2025, Casimir was most common in Pennsylvania, at 0.0 of every 1,000 boys born there.
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.