Guillermo — #831 US boys' name

What the Data Says About Guillermo

The Social Security Administration has registered 31,807 babies named Guillermo between 1885 and 2024, spanning 140 consecutive years of U.S. birth records. As a boy's name, Guillermo currently holds the #831 rank among boys for 2024. The name reached its historical peak in 1998, when 693 babies received it in a single year.

Decade-level aggregation shows that Guillermo performed strongest in the 1990s, accumulating 6,462 births during that ten-year window. Across the 15 decades of recorded activity, Guillermo shows a clear decline from its mid-century high. Geographically, the name is most concentrated in California, which accounts for 11,029 births — the largest state-level total in the dataset — followed by Texas and Arizona. In total, SSA state-level files list Guillermo in 35 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Guillermo 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 31,807 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.