Koichi — boys' name

What the Data Says About Koichi

The Social Security Administration has registered 145 babies named Koichi between 1914 and 2007, spanning 94 consecutive years of U.S. birth records. As a boy's name, Koichi currently falls outside the top 1,000 boys' names for 2007. The name reached its historical peak in 1921, when 16 babies received it in a single year.

Decade-level aggregation shows that Koichi performed strongest in the 1920s, accumulating 81 births during that ten-year window. Across the 6 decades of recorded activity, Koichi shows a clear decline from its mid-century high. Geographically, the name is most concentrated in Hawaii, which accounts for 66 births — the largest state-level total in the dataset — followed by Washington. In total, SSA state-level files list Koichi in 2 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Koichi 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 145 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.