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Casimir

#2,039 in 2025Boys' name

Proclamation of peace

Casimir has been given to 5,248 babies in the U.S. since 1894. In 2025 it ranked #2,039 of 13,926 boys’ names in use. Its peak year was 1919, with 220 recorded.

Babies named Casimir, 2025

1 in 45,400

Casimir over time, 1880–2025

Boys
010020030018801900192019401960198020002020

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Casimir: meaning, origin, and history

Proclamation of peace

Polish

What Casimir means

Casimir means “proclamation of peace”.

Dictionary etymologyReferences, data & attribution

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

Excerpt from Wiktionary: Casimir (English) · CC BY-SA 4.0

Wiktionary material is available under CC BY-SA 4.0.

Origin, language, and formation

Casimir is used in English. Its origins include Polish.

Pronunciation and spelling

In English, Casimir is pronounced /ˈkæzɪmɪɚ/.

American usage and historical context

In the United States, 5,248 boys were recorded with the name Casimir between 1894 and 2025. Its highest annual count was 220 in 1919; its best national rank was #393 in 1917.

Over 5 years its rank rose, from #3,659 in 2020 to #2,039 in 2025. Over 10 years its rank rose, from #3,306 in 2015 to #2,039 in 2025.

How common is Casimir?

Everything below is computed from the 2025 data — the most recent year available.

Among all babies, 2025
1 in 45,400
73 of 3,315,165 births
Among boys only
1 in 23,400
<0.01% of boys
Rank, 2025
#2,039
of 13,926 boys’ names in use
Coin-flip room size
31,479 kids
Even odds of a second one

Where Casimir sits on the popularity scale

Rarest published (5 a year)#1 — Liam (20,818)

Chance at least one other child shares the name

If the other children were drawn at random from the 2025 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%
Class of 30Under 1%
Grade of 100Under 1%
School of 5001%

Put another way: gather 31,479 children born in 2025 and it's an even bet that one of them is another Casimir. In a class of 30 the chance is Under 1%.

When Casimirs were born

Half of everyone ever recorded as Casimir was born before 1927 — so the typical Casimir is around 98 today.

Median birth year
1927
About 98 years old
Biggest decade
1920s
26.8% of all use
Born in the last 25 years
15.0%
Spread across generations
Recorded since 1950
1,554
People you could plausibly meet
Choose a decade

1920s — 26.8% of all recorded uses (1,404).

Is Casimir rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago
+338
Places climbed
Rank vs 5 years ago
+1,620
Places climbed
Rank vs 10 years ago
+1,267
Places climbed
Births vs 10 years ago
2.15×
More babies than then
Share of its own peak
33.2%
Peak was 1919 (220)
Years since peak
106
Years
Year-to-year steadiness
Shifting
21.0% average annual change
Best rank ever
#393
1917

Spellings of Casimir

Casimir is the most-used spelling, taking 54.8% of the 9,584 babies given a near-identical spelling.

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Where Casimir is used

Across 1910–2025, Casimir was most concentrated in Illinois — about 1 in 7,692 boys, against 1 in 36,151 across all states with data. It was least common in Texas (1 in —).

013 per 100,000

Most concentrated

  1. 1Illinois1 in 7,692
  2. 2Michigan1 in 20,000
  3. 3Pennsylvania1 in 20,000
  4. 4Wisconsin1 in 20,000
  5. 5New Jersey1 in 25,000
  6. 6New York1 in 25,000
  7. 7Connecticut1 in 50,000
  8. 8Indiana1 in 50,000

Shading is the share of that state's recorded boys given this name, not the raw count — otherwise the map would just show which states are biggest. Unshaded states have no published records for this period. U.S. birth records suppress state-year counts below 5; state counts therefore don't add up to the national total. Every state links to its full rankings. Casimir has too little recent state data to map, so this covers all years from 1910.

Casimir around the world

Where Casimir ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

  • England & Wales
    1997–2024
    #3,689
    in 2024
  • France
    1900–2025
    #6,093
    in 2025
  • Canada
    1991–2022
    #1,705
    in 2022

Popularity data from Office for National Statistics, Institut national de la statistique et des études économiques and Statistics Canada. ONS data under Open Government Licence v3.0. INSEE data under Licence Ouverte / Etalab 2.0. StatCan data under Statistics Canada Open Licence.

Notable people named Casimir

People whose public names include Casimir, backed by Wikidata given-name records and ordered by linked Wikimedia pages. The name may be a middle name.

People data from Wikidata (CC0). Fame is measured, not judged — the order reflects how widely each person is documented, not the U.S. birth records popularity this page is otherwise about.

Casimir in other languages

Cross-language forms and variants of Casimir. Linked forms have their own page here.

KasimirKazimirCasimiroKazimierzKazysKázmérKazimírKazimiroCasimirusKazimieras

Variant forms from Wikidata (CC0). Most are used mainly outside the United States; U.S. birth records statistics cover US usage only.

Casimir by the numbers

The raw record for each sex the name is used for.

As a boy's name

Rank in 2025
#2,039
Trend vs 5 yrs ago
Up 1,620
Best rank ever
#393
1917
Peak year
1919
220 that year
First recorded
1894
Last recorded
2025
All-time count
5,248
Count in 2025
73

Names similar to Casimir

Matched on shared beginnings and endings, similar length, and comparable popularity.

CashmirCasmirCaspianCastielCassidyCassianCashtonCassiusCasperCasenVladimirCasonCasimerCasimiroJahmirCassielCashiusKashmirCaswellCashmereCaseZamirCastonAhmir

Names with a curve like Casimir

Not spelling — timing. These names rose, peaked and faded in the same years as Casimir, so they read as being from the same moment even when they look nothing alike.

AloysiusAlbinFlorianWaldoEllsworthUrbanSolAlphonseIsadoreOrvalOswaldGuido

Sibling names for Casimir

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

Explore around Casimir

Top names of 1919, Casimir's peak yearThe 1910s in fullOther names that peaked in 1917Boys' names starting with CElegant Boy NamesPolish NamesUncommon Polish Boy Names