Holding steady, #10,695 for boys today.
Popularity of Casimiro since 1881
Babies named Casimiro per year in U.S. Social Security records. Raw births topped out in 1921, but relative to how few babies were recorded back then, Casimiro's real moment was 1881.
Data table (by decade)
| Decade | Boys |
|---|---|
| 1880s | 6 |
| 1890s | 0 |
| 1900s | 0 |
| 1910s | 78 |
| 1920s | 170 |
| 1930s | 113 |
| 1940s | 96 |
| 1950s | 115 |
| 1960s | 98 |
| 1970s | 104 |
| 1980s | 103 |
| 1990s | 73 |
| 2000s | 74 |
| 2010s | 27 |
| 2020s | 27 |
Meaning & origin
Casimiro is a rare name in the United States, reflective of its deep Slavic roots and Catholic heritage. According to Social Security data, it was first recorded in 1881, when it reached its peak rank of 10,695th, with an estimated 1 in every 284,679 boys receiving the name in that year. In 2025, the name remains stable in usage, with a similar rank of 10,695th and a 1-in-284,679 rate, indicating little change in its niche status over the decades. The name has not been concentrated in any top states, further underscoring its rarity. Casimiro is the Romance-language form of Kazimierz, a Polish royal name borne by Saint Casimir, whose veneration spread the name across Spain, Italy, and Portugal. Despite its low frequency, it carries a strong historical and saintly association, making it a distinctive choice for families honoring Slavic or Catholic traditions.
Casimiro is the Spanish, Italian, and Portuguese form of the Slavic name Kazimierz, derived from the elements 'kaziti' (to destroy) and 'miru' (peace, world). The name was borne by several Polish saints and rulers, most notably Saint Casimir, a 15th-century Polish prince and patron saint of Lithuania. It has been used across Catholic Europe as a result of veneration for the saint, and remains common in Spanish- and Portuguese-speaking countries.
Nicknames & variants
Nicknames: Casi, Miro, Casso
Sibling names for Casimiro
Names that share Casimiro's style, for a brother or sister.
