Baby Names US
boys' name ★ peaked 1919

Casimir

Meaning proclamation of peace Gender Boy Rank 2025 #2,039 Trend ↑ Rising 122%

From a Polish royal name and saint's name Kazimierz, of Slavic origin, meaning "proclamation of peace".

Rank 2025
#2,039
among boys · ↑338 vs 2024
Babies in 2025
73
named Casimir · +24% vs 2024
How common
1 in 23,398
boys born in 2025
Peak year
1919
220 babies
All-time total
5,248
#1,729 all-time among boys
First recorded
1894
in Social Security records

Casimir popularity over time

5,248 babies have been named Casimir since 1894, according to official Social Security records. Switch measure to see births per year or the yearly rank.

Measure
Births per 1,000 babies of that sex, comparable across eras
0.060.130.190.2518801900192019401960198020002020Peak 1919Boys

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade Boys Per year Change Best rank
1880s – – – –
1890s 31 3 – #838
1900s 111 11 +258% #514
1910s 1,277 128 +1050% #393
1920s 1,404 140 +10% #413
1930s 546 55 -61% #635
1940s 325 33 -40% #1,010
1950s 252 25 -22% #1,222
1960s 133 13 -47% #1,900
1970s 99 10 -26% #2,916
1980s 132 13 +33% #2,715
1990s 137 14 +4% #3,073
2000s 200 20 +46% #3,685
2010s 284 28 +42% #3,010
2020s (to 2025) 317 53 +86% #2,039

Where Casimir is heading

A five-year projection from the recent trend in births per 1,000 boys (damped so it flattens over time), converted to babies at today's birth totals. The implied rank places that projection in the 2025 field. A projection, not a promise: real trends bend.

Year Projected babies Per 1,000 boys Implied rank
2026 83 0.05 outside top 500
2027 93 0.05 outside top 500
2028 101 0.06 outside top 500
2029 110 0.06 outside top 500
2030 117 0.07 outside top 500

The story of Casimir

Casimir is rare for boys in the United States, ranked #2,039 in 2025 with 73 babies given the name. It is currently rising compared with a decade ago.

Since 1894, 5,248 American babies have been named Casimir. Its peak came in 1919, when 220 newborns received the name, the signature sound of the 1910s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Casimir stood among all boys' names in any year, or use the compare tool to plot it against other names.

How old are people named Casimir?

The median living Casimir is about 29 years old; half are between 9 and 67. An estimated 1,700 people named Casimir are alive in the United States today.

median 29 020406080100

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Casimir year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year Boys Boys rank
2025 73 #2,039
2024 59 #2,377
2023 58 #2,363
2022 58 #2,414
2021 40 #3,029
2020 29 #3,662
2019 29 #3,733
2018 31 #3,546
2017 24 #4,244
2016 29 #3,700
2015 34 #3,307
2014 31 #3,467
2013 37 #3,010
2012 23 #4,274
2011 22 #4,389
2010 24 #4,128
2009 22 #4,455
2008 28 #3,754
2007 25 #4,027
2006 15 #5,559
2005 23 #3,961
2004 23 #3,884
2003 14 #5,311
2002 23 #3,685
2001 11 #6,080
2000 16 #4,612
1995 10 #5,554
1990 20 #3,073
1985 15 #3,093
1980 16 #2,848
1975 5 #5,582
1970 11 #2,916
1965 15 #2,099
1960 16 #2,051
1955 24 #1,574
1950 35 #1,222
1945 38 #1,041
1940 36 #1,093
1935 46 #931
1930 93 #635
1925 123 #558
1920 206 #413
1915 178 #403
1910 17 #732
1905 12 #706
1900 7 #1,063
1895 6 #997
1890 – –
1885 – –
1880 – –

Famous people named Casimir

The most globally famous bearers of the name, ranked by fame across Wikipedia editions (Pantheon project, MIT).

  1. 1 Casimir Pulaski Casimir Pulaski Polish nobleman and American Revolutionary War general (1745–1779) 18th century
  2. 2 Casimir III the Great Casimir III the Great King of Poland from 1333 to 1370 1310–1370 · Medieval
  3. 3 Casimir IV Jagiellon Casimir IV Jagiellon King of Poland (1447–1492) and Grand Duke of Lithuania (1440–1492) 1427–1492 · Medieval
  4. 4 Casimir I the Restorer Duke of Poland 1016–1058 · Medieval
  5. 5 Casimir Funk Casimir Funk Polish-American biochemist (1884–1967) 19th century
  6. 6 Casimir II the Just Casimir II the Just High Duke of Poland 1138–1194 · Medieval
  7. 7 Casimir Pierre Périer Casimir Pierre Périer French statesman (1777–1832) 18th century
  8. 8 Casimir Delavigne Casimir Delavigne French poet and dramatist (1793–1843) 18th century
  9. 9 Casimir de Candolle Casimir de Candolle Swiss botanist 1836–1918 · 19th century

Portraits from Wikipedia (Wikimedia Commons).

Frequently asked questions

Quick answers about Casimir, drawn from the same Social Security data as the charts above.

How old is the average Casimir?

The median living Casimir is about 29 years old. Half of all living Casimirs are between 9 and 67 years old.

How many people named Casimir are alive today?

An estimated 1,700 people named Casimir are alive in the United States, based on 5,248 recorded births and Social Security life tables.

What does the name Casimir mean?

From a Polish royal name and saint's name Kazimierz, of Slavic origin, meaning "proclamation of peace".

How popular is the name Casimir in 2025?

Casimir ranked #2,039 among boys' names in the United States in 2025, with 73 babies given the name, according to Social Security Administration data.

How many people are named Casimir?

5,248 babies have been named Casimir in the United States since 1894, based on Social Security card applications.

When was the name Casimir most popular?

Casimir peaked in 1919, when 220 newborns received the name.

Is Casimir a boy or girl name?

Casimir is overwhelmingly a boy's name: 100% of babies with the name.

Is the name Casimir rising or falling?

Casimir is on the rise, noticeably more popular now than a decade ago.

Will Casimir become more popular?

Casimir is trending upward. If the recent trend holds, we project roughly 117 boys named Casimir in 2030, which would rank outside the top 500. Forecasts assume the current trend continues and become less certain further out.

Who are famous people named Casimir?

Well-known people named Casimir include Casimir Pulaski (military personnel), Casimir III the Great (politician), Casimir IV Jagiellon (politician).

Names like Casimir

Names that sound and feel close to Casimir: shared sounds, similar era, similar popularity. Each links to its full history.

Compare Casimir with similar names → More names starting with C →