Brennan — #1055 US boys' name

What the Data Says About Brennan

The Social Security Administration has registered 33,032 babies named Brennan between 1916 and 2024, spanning 109 consecutive years of U.S. birth records. As a boy's name, Brennan currently holds the #1055 rank among boys for 2024. The name reached its historical peak in 2009, when 1,464 babies received it in a single year. Brennan is classified as unisex in SSA records: the opposite-sex variant accounts for 2,218 additional births since 1973.

Decade-level aggregation shows that Brennan performed strongest in the 2000s, accumulating 11,745 births during that ten-year window. Across the 10 decades of recorded activity, Brennan shows a clear decline from its mid-century high. Geographically, the name is most concentrated in California, which accounts for 2,690 births — the largest state-level total in the dataset — followed by Texas and Louisiana. In total, SSA state-level files list Brennan in 50 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Brennan 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 33,032 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.