Given name & surname · also Polish
Casimir
“one who demands peace”
Casimir is used as a given name and a surname. One Slavic interpretation is “one who demands peace.”
Original PolishKazimierz
Meaning & origin
What it means
One Slavic interpretation is “one who demands peace.”
Where it comes from
An origin associated with this spelling is Polish.
How it developed
Casimir is used as a spelling variant of Polish.
The story
Published U.S. birth records include this spelling as early as 1894. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Casimir through the years
- Babies since 1880
- 5,248
- 5,248 boys · 0 girls
- Most popular year
- 1919
- 220 babies
- 2025
- 73
- #2,039 for boys
- 2021–25 vs 2016–20
- +103%
- Rising fast
Where it’s given
By the numbers
In 2025, this name appeared in 73 U.S. birth records for boys, ranking No. 2,039 among boys’ names. Average annual use for boys was 102.8% higher in 2021–2025 than in 2016–2020. Its largest published annual count for boys was 220 in 1919. In 2025, New York had the largest reported state-level birth count for boys with this name (8). Published U.S. population figures for this spelling include 1,712 as a first name in 2020; 2,222 as a surname in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Casimir’s family of names
In English usage, Casimir shares a linguistic root with the Latvian form KAZIMIRS. In English usage, Casimir has a conventional equivalent in the Spanish form Casimiro. Casimir has a related form in Casimiro.
Inner ring: nicknames and forms · outer: across languages.
Around the world
Casimir has relatives in 18 languages. Lines run from its Proto-Slavic roots to each of them.
16 related names in 18 languages. Point at a dot, or tab to the map and use the arrow keys.
Nicknames & forms 10
Diminutives, pet forms, short forms and variants used alongside the name.
- Kasimirvariant · German
- Casmirvariant
- Casimirovariant · Spanish, Portuguese
- Casimiervariant
- Cassimirlikely variant
- Casimeirvariant
- Casimyrvariant
- Casimearvariant
Show 2 moreShow fewer
Across languages 16
Equivalents and cognates in other languages, plus older forms it grew from.
See also 16
Names our sources mention alongside this one. They are related in story or meaning, not forms of this name.
People named Casimir
- Casimir FunkPolish-American biochemist1884–1967
- Casimir DelavigneFrench poet and dramatist (1793-1843)
- Casimir II the JustHigh Duke of Poland (1138-1194)
- Casimir PulaskiPolish nobleman, general in the American Revolutionary War1745–1779
- Casimir Pierre PérierFrench statesman (1777-1832)
- Casimir Oyé-MbaGabonese politician (1942–2021)
- Casimir NingaChadian footballerborn 1993
- Casimir LefaucheuxFrench gunsmith (1802–1852)
- Casimir, Margrave of Brandenburg-KulmbachMargrave of Bayreuth (1481-1527)1482–1527
Listed by how widely each person is written about, which says nothing about the name itself.
Similar names
If you love Casimir, these share its style, era, origin or sound, from outside its own family.
Wilmer
“a strong-willed and wellknown man”
>99% boys
Warner
“of the defending army”
98% boys · 2% girls
Emile
“one who is eager; an industrious man”
99% boys · 1% girls
Cecil
“one who is blind” · “the sixth-born child”
>99% boys
Arnold
“the eagle ruler”
>99% boys
Emil
“one who is eager; an industrious man”
>99% boys
Meyer
“giving light” · “a large man”
85% boys · 15% girls
Harland
“an athletic woman” · “from the army”
95% boys · 5% girls