Kastor — boys' name

What the Data Says About Kastor

The Social Security Administration has registered 10 babies named Kastor between 2017 and 2021, spanning 5 consecutive years of U.S. birth records. As a boy's name, Kastor currently falls outside the top 1,000 boys' names for 2021. The name reached its historical peak in 2017, when 5 babies received it in a single year.

Decade-level aggregation shows that Kastor performed strongest in the 2010s, accumulating 5 births during that ten-year window. Across the 2 decades of recorded activity, Kastor shows a stable profile with only moderate drift from its peak decade.

No etymological entry is currently available for Kastor 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 10 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.