Total births
5,248
Boys' name · since 1894
Casimir
Casimir has 5,248 recorded births since 1894 in federal Social Security data, most heavily in 1919 -- full year-by-year trend, decade aggregates, and state rankings follow.
- #2372
- among boys today
- 5,248
- born since 1894
- 1920s
- peak decade
- 83%
- more common than other boys
Yes -- Casimir is the #2372 most popular boys' name in the U.S. today, with 5,248 recorded since 1894.
Social Security Administration records show Casimir recorded 5,248 times among boys since 1894, holding rank #2372 nationally today, ahead of 83% of boys, peaking in the 1920s. This profile derives year-by-year birth trends, decade totals, and state-level distribution directly from SSA birth-registration files spanning 1894 to 2025.
- #2372 among boys today
- 5,248 born since 1894
- 1920s peak decade
- 83% more common than other boys
Data updated Jul 2026
The verdict
Casimir is currently the #2372 boys' name in America, more common than 83% of boys - 5,248 born since 1894, peaking in the 1920s.
- #2372
- among boys today
- 5,248
- born since 1894
- 1920s
- peak decade
- 83%
- more common than other boys
Casimir vs. every other boys name in current SSA rankings
#2372
of 14,294 boys in use
More common than 83% of names given to boys today.
1920s
Peak decade
27% of everyone ever named Casimir was born in this single decade.
1919
Single peak year
220 babies were named Casimir in 1919 - its busiest year on record.
How Casimir compares
5,248 Top 12% higher than 88% of 14,294 names currently given to boys
Based on all-time total births among currently-ranked boys names. Names with fewer occurrences are grouped into wider buckets on the right.
Source U.S. Social Security Administration, national baby name data
How the numbers stack up
Casimir's all-time total is 14x the median boys name, and Liam still leads by a wide margin.
| Metric | Casimir | Median boys name (Elchonon) | #1 boys name (Liam) |
|---|---|---|---|
| All-time total births | 5,248 | 367 | 358,536 |
| Peak-year births | 220 | 23 | 22,252 |
Casimir's usage pattern, beyond the headline number
Casimir splits its recorded history at 1960: 25% of all births land in the more recent half, 75% in the earlier half, leaning more toward its earlier era than today's. The single quietest year was 1894 (5 births) -- compare that against the 1919 peak of 220 for a sense of just how much the name's popularity has swung.
Casimir at a glance
Outside the top 1,000Peak year
1919
Current rank
#2,372
Active since
1894
Casimir popularity over time
Annual U.S. births registered with the Social Security Administration · 1894–2025
- Peak year (1919)
- 220
- Annual births at peak, across 132 years of records
Casimir by decade
Total births in each ten-year window, peak vs trough at a glance
1920s was Casimir's strongest decade.
1,404 babies received the name during that ten-year window, about 27% of all-time use.
Casimir births by decade
Total births in each ten-year window
- 1890s 31
1890s
31 births
- 1900s 111
1900s
111 births
- 1910s
1910s
1,277 births
- 1920s
1920s
1,404 births
- 1930s 546
1930s
546 births
- 1940s 325
1940s
325 births
- 1950s 252
1950s
252 births
- 1960s 133
1960s
133 births
- 1970s 99
1970s
99 births
- 1980s 132
1980s
132 births
- 1990s 137
1990s
137 births
- 2000s 200
2000s
200 births
- 2010s 284
2010s
284 births
- 2020s 317
2020s
317 births
What this shows Peak: 1920s at 1,404 births (27% of all-time use).
How Casimir compares to similarly-sized names
Years in SSA records vs. share of all-time use concentrated in the single peak year, among 15 boys names closest to Casimir's total volume
Casimir vs 15 similarly-sized boys names
Casimir by state
Where Casimir concentrates geographically, total births since 1894
| Rank | State | Visual share | Births | Share of total |
|---|---|---|---|---|
| #1 | Illinois | | 1,078 | 20.5% |
| #2 | New York | | 493 | 9.4% |
| #3 | Pennsylvania | | 429 | 8.2% |
| #4 | Michigan | | 333 | 6.3% |
| #5 | New Jersey | | 193 | 3.7% |
| #6 | Ohio | | 180 | 3.4% |
| #7 | Wisconsin | | 177 | 3.4% |
| #8 | Indiana | | 90 | 1.7% |
Illinois share of Casimir's total US births 20.5%
Even split
1,078 of 5,248 births nationwide. Compared to a flat distribution across 17 reporting states.
Casimir appears in 17 states. Explore state details →
Frequently Asked Questions
How popular is the name Casimir? ▼
Casimir has been given to 5,248 babies in the U.S. since 1894, according to SSA data. Among boys, it ranks #2372 as of the latest data. 220 babies were born in 1919, its single highest year.
When was Casimir most popular? ▼
Casimir was most popular in the 1920s decade with 1,404 total births. The single peak year was 1919.
Where is Casimir most popular? ▼
The top states for the name Casimir are Illinois (1,078 births), New York (493 births), Pennsylvania (429 births).
How long has the name Casimir been used? ▼
Records for Casimir go back to 1894, giving 132 years of history through 2025.
What names are similar to Casimir? ▼
Names with a similar sound or spelling include Casey, Cash, Cason, Case, and 4 more. These share a common prefix and are also used for boys.
What to do with Casimir's data
- Casimir's decade-level peak was the 1920s (1,404 total births); usage has since declined to 317 in the 2020s -- if you're weighing a "classic revival" angle, the trend line argues against it.
- Illinois records the most Casimirs (1,078 births) -- see the full state breakdown if geography matters to your decision. Illinois names
- Weighing it against an alternative? Put two names side by side. Compare names
Figures reflect SSA-reported births only; see the methodology above for the privacy-suppression floor.
Keep exploring Casimir
Nearby Names Like Casimir
Names with a similar sound, spelling, or feel to Casimir
Casey Boy
#311 116,675 births
Cash Boy
#316 27,705 births
Cason Boy
#856 11,308 births
Case Boy
#724 9,926 births
Cassius Boy
#569 9,736 births
Compare Casimir side by side: Casimir vs Casey Casimir vs Cash Casimir vs Cason
Related Names
Names with a similar popularity rank to Casimir
Data Sources
Data as of July 2026. Source: U.S. Social Security Administration (SSA).
According to the Social Security Administration, this profile draws directly from the agency's public-use baby-name files (updated June 2026). See our methodology for the full extraction, aggregation, and privacy-suppression rules.
Primary: Source: U.S. Social Security Administration, Baby Names from Social Security Card Applications, National Data, 1894–2025 (ssa.gov/oact/babynames).
State-level: Source: U.S. Social Security Administration, Baby Names, State-Level Files (namesbystate.zip).
Cite this page
NameAlmanac Editorial. "Casimir: #2372 Boys' Name - 5,248 Births, Peak 1919." NameAlmanac. Accessed via https://namealmanac.com/name/casimir. Licensed CC BY-SA 4.0.
Name Almanac is rendered directly from the Social Security Administration's public baby-name files, no number is typed in by an editor. This profile for Casimir draws directly on SSA national and state-level files, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of July 2026.