Colby — #581 US boys' name

What the Data Says About Colby

The Social Security Administration has registered 53,512 babies named Colby between 1888 and 2024, spanning 137 consecutive years of U.S. birth records. As a boy's name, Colby currently holds the #581 rank among boys for 2024. The name reached its historical peak in 2001, when 3,859 babies received it in a single year. Colby is classified as unisex in SSA records: the opposite-sex variant accounts for 4,123 additional births since 1950.

Decade-level aggregation shows that Colby performed strongest in the 2000s, accumulating 19,182 births during that ten-year window. Across the 13 decades of recorded activity, Colby shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Texas, which accounts for 5,725 births — the largest state-level total in the dataset — followed by California and Florida. In total, SSA state-level files list Colby in 50 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Colby 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 53,512 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.