Casimir — #2392 US boys' name

What the Data Says About Casimir

The Social Security Administration has registered 5,174 babies named Casimir between 1894 and 2024, spanning 131 consecutive years of U.S. birth records. As a boy's name, Casimir currently holds the #2392 rank among boys for 2024. The name reached its historical peak in 1919, when 220 babies received it in a single year.

Decade-level aggregation shows that Casimir performed strongest in the 1920s, accumulating 1,404 births during that ten-year window. Across the 14 decades of recorded activity, Casimir shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Illinois, which accounts for 1,078 births — the largest state-level total in the dataset — followed by New York and Pennsylvania. In total, SSA state-level files list Casimir in 16 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Casimir in our reference dataset. These figures derive from SSA's annual national and state-level name files, which include any name appearing at least five times in a given year or state-year; names below that threshold are suppressed for privacy and therefore excluded from the totals shown here. The 5,174 total represents a lower bound — actual usage may be higher in years or states where the count fell below the disclosure floor. This page is provided for informational and research purposes only and does not constitute personal, legal, or naming advice.