Casimiro — boys' name

What the Data Says About Casimiro

The Social Security Administration has registered 1,078 babies named Casimiro between 1881 and 2023, spanning 143 consecutive years of U.S. birth records. As a boy's name, Casimiro currently falls outside the top 1,000 boys' names for 2023. The name reached its historical peak in 1921, when 28 babies received it in a single year.

Decade-level aggregation shows that Casimiro performed strongest in the 1920s, accumulating 170 births during that ten-year window. Across the 13 decades of recorded activity, Casimiro shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Texas, which accounts for 436 births — the largest state-level total in the dataset — followed by California and New Mexico. In total, SSA state-level files list Casimiro in 3 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Casimiro 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 1,078 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.