Rex — #792 US boys' name

What the Data Says About Rex

The Social Security Administration has registered 60,160 babies named Rex between 1880 and 2024, spanning 145 consecutive years of U.S. birth records. As a boy's name, Rex currently holds the #792 rank among boys for 2024. The name reached its historical peak in 1951, when 1,503 babies received it in a single year.

Decade-level aggregation shows that Rex performed strongest in the 1950s, accumulating 13,500 births during that ten-year window. Across the 15 decades of recorded activity, Rex shows a clear decline from its mid-century high. Geographically, the name is most concentrated in California, which accounts for 4,473 births — the largest state-level total in the dataset — followed by Texas and Indiana. In total, SSA state-level files list Rex in 48 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Rex 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 60,160 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.