Declining since 2021, #10,695 for boys today.
Popularity of Casmir since 1913
Babies named Casmir per year in U.S. Social Security records.
Data table (by decade)
| Decade | Boys |
|---|---|
| 1910s | 117 |
| 1920s | 102 |
| 1930s | 36 |
| 1940s | 11 |
| 1950s | 0 |
| 1960s | 0 |
| 1970s | 0 |
| 1980s | 0 |
| 1990s | 0 |
| 2000s | 15 |
| 2010s | 11 |
| 2020s | 50 |
Meaning & origin
Casmir first appeared in U.S. records in 1913, with its peak popularity occurring in 1915. Since then, its use has declined, and since 2021 it has been on a falling trajectory. As of the latest data from 2025, the name ranks 10,695 and has a frequency of 1 in 284,679 births. The name has no recorded top states, indicating a scattered usage. It remains a distinctive, heritage-rooted name for families drawn to Slavic traditions.
Casmir is a variant of Casimir, derived from the Slavic elements kaziti (to destroy) and mir (peace), often interpreted as 'one who destroys peace' but more positively as 'he who commands peace.' The name was borne by several Polish saints and kings, and entered English use in the 19th century.
Nicknames & variants
Nicknames: Cas, Cassie, Kaz
Sibling names for Casmir
Names that share Casmir's style, for a brother or sister.
