Costello — boys' name

What the Data Says About Costello

The Social Security Administration has registered 61 babies named Costello between 1942 and 2021, spanning 80 consecutive years of U.S. birth records. As a boy's name, Costello currently falls outside the top 1,000 boys' names for 2021. The name reached its historical peak in 1951, when 11 babies received it in a single year. Costello is classified as unisex in SSA records: the opposite-sex variant accounts for 5 additional births since 1931.

Decade-level aggregation shows that Costello performed strongest in the 1950s, accumulating 23 births during that ten-year window. Across the 6 decades of recorded activity, Costello shows a clear decline from its mid-century high.

No etymological entry is currently available for Costello 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 61 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.