Llewellyn — #6450 US boys' name

What the Data Says About Llewellyn

The Social Security Administration has registered 3,398 babies named Llewellyn between 1880 and 2024, spanning 145 consecutive years of U.S. birth records. As a boy's name, Llewellyn currently holds the #6450 rank among boys for 2024. The name reached its historical peak in 1916, when 69 babies received it in a single year. Llewellyn is classified as unisex in SSA records: the opposite-sex variant accounts for 330 additional births since 1906.

Decade-level aggregation shows that Llewellyn performed strongest in the 1920s, accumulating 566 births during that ten-year window. Across the 15 decades of recorded activity, Llewellyn shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Pennsylvania, which accounts for 253 births — the largest state-level total in the dataset — followed by New York and Maine. In total, SSA state-level files list Llewellyn in 13 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Llewellyn 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 3,398 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.