Kaisei — #8719 US boys' name

What the Data Says About Kaisei

The Social Security Administration has registered 131 babies named Kaisei between 2005 and 2024, spanning 20 consecutive years of U.S. birth records. As a boy's name, Kaisei currently holds the #8719 rank among boys for 2024. The name reached its historical peak in 2007, when 10 babies received it in a single year.

Decade-level aggregation shows that Kaisei performed strongest in the 2010s, accumulating 70 births during that ten-year window. Across the 3 decades of recorded activity, Kaisei shows notable generational variation in parental adoption. Geographically, the name is most concentrated in California, which accounts for 5 births — the largest state-level total in the dataset — followed by . In total, SSA state-level files list Kaisei in 1 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Kaisei 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 131 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.