A 1910s favorite, climbing again.
Popularity of Casimir since 1894
Babies named Casimir per year in U.S. Social Security records.
Data table (by decade)
| Decade | Boys |
|---|---|
| 1890s | 31 |
| 1900s | 111 |
| 1910s | 1,277 |
| 1920s | 1,404 |
| 1930s | 546 |
| 1940s | 325 |
| 1950s | 252 |
| 1960s | 133 |
| 1970s | 99 |
| 1980s | 132 |
| 1990s | 137 |
| 2000s | 200 |
| 2010s | 284 |
| 2020s | 317 |
Meaning & origin
Casimir is a name with a long European history, yet it has never been common in the United States. It first appeared on the U.S. charts in 1894 and reached its peak popularity in 1919, during a period when Polish immigration was high. After a long decline, the name has been rising again since 1987, reflecting a broader revival of vintage and ethnic names. As of 2025, Casimir ranked 2035, with an estimated 1 in 23,398 boys receiving the name. Its top states are Colorado, Pennsylvania, and New York, suggesting a concentration among families with Polish heritage or a taste for distinctive classical names.
Casimir is derived from the Slavic elements kaziti 'to destroy' and miru 'peace', thus meaning 'destroyer of peace' or, by later reinterpretation, 'he who proclaims peace'. The name was borne by Saint Casimir, a 15th-century Polish prince and patron saint of Lithuania. It became a dynastic name in the Polish-Lithuanian Commonwealth and was later adopted by French and English speakers, often in the French spelling Casimir.
Where Casimir is most popular
Births per 100,000 boys by state. Press play or drag the slider to watch it move across the decades. The lightest shade means too few recorded births.
Nicknames & variants
Nicknames: Kaz, Kazi, Cas
Sibling names for Casimir
Names that share Casimir's style, for a brother or sister.
