Tatsuo — boys' name

What the Data Says About Tatsuo

The Social Security Administration has registered 222 babies named Tatsuo between 1915 and 1940, spanning 26 consecutive years of U.S. birth records. As a boy's name, Tatsuo currently falls outside the top 1,000 boys' names for 1940. The name reached its historical peak in 1916, when 57 babies received it in a single year.

Decade-level aggregation shows that Tatsuo performed strongest in the 1920s, accumulating 112 births during that ten-year window. Across the 4 decades of recorded activity, Tatsuo shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Hawaii, which accounts for 111 births — the largest state-level total in the dataset — followed by California. In total, SSA state-level files list Tatsuo in 2 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Tatsuo 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 222 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.