Tiernan — #4129 US boys' name

What the Data Says About Tiernan

The Social Security Administration has registered 1,452 babies named Tiernan between 1985 and 2024, spanning 40 consecutive years of U.S. birth records. As a boy's name, Tiernan currently holds the #4129 rank among boys for 2024. The name reached its historical peak in 2007, when 86 babies received it in a single year. Tiernan is classified as unisex in SSA records: the opposite-sex variant accounts for 195 additional births since 1989.

Decade-level aggregation shows that Tiernan performed strongest in the 2000s, accumulating 660 births during that ten-year window. Across the 5 decades of recorded activity, Tiernan shows a clear decline from its mid-century high. Geographically, the name is most concentrated in New York, which accounts for 99 births — the largest state-level total in the dataset — followed by California and Pennsylvania. In total, SSA state-level files list Tiernan in 12 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Tiernan 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 1,452 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.