Casimir
Masculine · “destroyer of peace”
Casimir is the destroyer of peace in Polish — kazić and mir — a name given to kings, which reads oddly until you know the second element also means the world.
How old is the name Casimir?
Casimir first appears in US birth records in 1894 — 131 years ago. The typical Casimir alive today was born around 1927, making them about 98 years old. About 1,700 people named Casimir are estimated to be alive in the US today.
When was the name Casimir most popular?
Casimir peaked in 1917, reaching #393 nationally. Today it ranks #2035, 1,642 places below that high. See the whole 1917 chart.
Where it comes from
From kaziti mir to Casimir
The story of Casimir
Four kings of Poland were called Kazimierz, and Casimir III is the only Polish monarch called the Great; a saying holds he found a Poland of wood and left one of stone. Casimir Pulaski fought in the American Revolution and died at Savannah. The name appears in American records in current use.
Meaning
destroyer of peace; famous
From the Slavic kaziti, 'to destroy', and mir, 'peace' or 'world'. The name reads as one who ends peace — a warlord's name. Mir carries both senses in Slavic, which softens it somewhat. The elements are ordinary Slavic and the compound is documented.
How the name formed
- kaziti mir
- Kazimierz
- Casimir
Related forms: Kazimierz · Casimir · Казимир
Pronouncing Casimir
KAZ-ih-meer
Three syllables, stress on the first. Polish Kazimierz is ka-ZHEE-myesh, quite different.
Nicknames for Casimir
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1894
- Most boys named
- 1919220 — the highest on record
- Peak rank
- #393reached in 1917
- Change vs 2022
- +25.9%73 in 2025, from 58
Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.
Casimir in other languages
The same name elsewhere
- Kazimierz in Polish — related form
- Casimir in French — same name
- Казимир in Russian — transliteration
Strongest US states over the last decade: California, New York, Pennsylvania.
Casimirs among us
people named Casimir are estimated to be alive in the US today
About 1 boy in 23,398 born in 2025 was named Casimir
Estimated from SSA birth records and published actuarial life tables. Method
Spellings of Casimir
- #2035
- Casimir on the 2025 chart
- #815
- counting every spelling
The SSA counts spellings, not names. Casimir went to 73 boys in 2025, but Kazimir, Kasimir and Cazimir are the same name said out loud. Together the 4 spellings went to 113, which makes it the 815th most-given boys’ name of the year — 1,220 places above the chart.
- Casimir73
- Kazimir29
- Kasimir6
- Cazimir5
About 1 boy in 15,116 born in 2025 was given one of these spellings — against 1 in 23,398 for Casimir itself.
Spellings are grouped by a fixed rule that folds interchangeable English spellings of one sound (ck/k, ph/f, x/ks, a non-initial y for i) and keeps vowels apart, so Sean and Shawn stay separate names. It errs towards splitting: a family here is never larger than the truth. SSA national data, 2025. Method
Is it right for you
What happens to a name after it peaks
The Lacy test
Every popular name lives one long story — a climb, a peak, a slow settling back. Casimir's later chapters haven't been written yet, so we borrowed them: Lacy climbed just as high around 1900, and its whole arc is on record. Line the two peaks up, and Lacy's path sketches the road Casimir is walking now.
Casimir sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.
A scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored
Where Casimir is headed
Casimir looks set to keep climbing gently, with roughly 30% more babies a year by 2030 if the current curve holds.
Medium confidence — fitted on official counts through 2025.
A damped-trend projection of the official birth data — a sketch of momentum, not a promise. Every name's forecast, ranked.
Casimir beside its neighbors
The names ranked closest to Casimir in 2025, in babies rather than position — the bars are to scale.
US boys given each name in 2025.
The trade-off
- A name meaning destroyer of peace given to four kings is a genuinely striking fact.
- Cas and Kazik are two short forms, both with real use.
- A hero of the American Revolution carries it.
- The literal meaning is aggressive and surprises people.
- The Polish original is spelled and said entirely differently.
- Three syllables and a distinctly Continental register.
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What they receive
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Casimir
Masculine · #2035 in the U.S.
Frequently asked
- How many Casimirs are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 1,700 people named Casimir are estimated to be alive in the US today.
- How do you spell Casimir?
- Casimir is the most-used spelling in US records — 73 of the 113 babies given the name in 2025. The others recorded are Kazimir, Kasimir and Cazimir.
- How popular is the name Casimir in 2025?
- Casimir ranks #2035 among US boy names in 2025, with 73 babies given the name.
- How rare is the name Casimir?
- About 1 in every 23,398 US boys born in 2025 was named Casimir — 73 in all.
- Will my child share the name Casimir with classmates?
- Casimir will almost certainly be the only one in school.
Ranked beside Casimir
Names sitting at a similar level of popularity right now.
Mavrick#2035 · Ezrael#2035 · Armin#2035 · Aamir#2035 · Harland#2035 · Hudsyn#2035 · Tylin#2035 · Arin#2035
Looking for what else is popular rather than what resembles Casimir? See the current top 100.
Choosing between Casimir and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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