Casimer — boys' name

What the Data Says About Casimer

The Social Security Administration has registered 1,895 babies named Casimer between 1895 and 2017, spanning 123 consecutive years of U.S. birth records. As a boy's name, Casimer currently falls outside the top 1,000 boys' names for 2017. The name reached its historical peak in 1918, when 135 babies received it in a single year.

Decade-level aggregation shows that Casimer performed strongest in the 1910s, accumulating 767 births during that ten-year window. Across the 13 decades of recorded activity, Casimer shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Illinois, which accounts for 312 births — the largest state-level total in the dataset — followed by New York and Michigan. In total, SSA state-level files list Casimer in 10 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Casimer 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 1,895 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.