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Home › Baby Names Directory › Casimir

Casimir

♂ Boy

Pronounced KAZ-ih-meer /ˈkæz.ɪ.mɪər/High

Meaning: Proclaimer of peace; from Polish Kazimierz (kazac: to command/proclaim + mir: peace)High

In 30 seconds: A Polish royal name meaning 'proclaimer of peace,' from kazac (to command) and mir (peace). Five Polish kings bore this name — Saint Casimir, patron of Poland and Lithuania, made it the most celebrated royal name in Polish history.
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Origin HighPolish, Slavic
MeaningProclaimer of peace; from Polish Kazimierz (kazac: to command/proclaim + mir: peace)
U.S. rank (2024)#2393 ↘ Falling
2024 U.S. births58 boys (0.00% of U.S. boys)
Peak year1919
Total births (all-time)≈ 5,174

Popularity in the U.S. · SSA data

peak 191918942024

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Casimir is the anglicized form of Polish Kazimierz, from Slavic kazac (to command, to proclaim) and mir (peace, world). Five Polish kings bore this name. Saint Casimir (1458–1484), patron of Poland and Lithuania, is venerated on March 4.

Casimir has been used in Polish American communities and among families drawn to distinctive historical royal names. Its 2024 ranking of #2393 for boys reflects modest but genuine use.

Did you know? Saint Casimir (1458–1484) was a Polish prince who refused an arranged marriage and a military campaign, spending his days in prayer and charity. He died of tuberculosis at 25 and was canonized in 1521 — the only man among the royalty of his era to achieve sainthood through refusal of worldly power.
Overall data confidence 86%
Behind the Name — Casimir — Polish/Slavic etymologyU.S. Social Security Administration — popularity data

Variations

KazimierzCasimiro

Nicknames

CasCazKaz

Famous Bearers

  • ★Saint Casimir (1458–1484)
    Polish prince and patron saint of Poland and Lithuania. Died at 25 after a life of prayer and charity. Canonized in the early 16th century.

If you like Casimir…

Kazimir— the Slavic form of the same name
Yulian— a similarly popular pick
Aleksandr— lands in the same popularity range
Antoni— a fellow Polish choice
Teodor— a similarly popular pick

Explore names like Casimir

By themethree-syllableslavicsaintroyalpolishpeace
By meaningPeace

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Frequently Asked

What does the name Casimir mean?

Casimir means 'proclaimer of peace,' from Polish Kazimierz (kazac: to command + mir: peace).

How do you pronounce Casimir?

It's said KAZ-ih-meer /ˈkæz.ɪ.mɪər/ — three syllables, stress on the first.

Is Casimir a boy or girl name?

Casimir is used as a boy's name.

How popular is Casimir?

Casimir ranked #2393 for U.S. boys in 2024.

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