Caio — #3737 US boys' name

What the Data Says About Caio

The Social Security Administration has registered 687 babies named Caio between 1990 and 2024, spanning 35 consecutive years of U.S. birth records. As a boy's name, Caio currently holds the #3737 rank among boys for 2024. The name reached its historical peak in 2023, when 40 babies received it in a single year.

Decade-level aggregation shows that Caio performed strongest in the 2010s, accumulating 250 births during that ten-year window. Across the 4 decades of recorded activity, Caio shows notable generational variation in parental adoption. Geographically, the name is most concentrated in Massachusetts, which accounts for 80 births — the largest state-level total in the dataset — followed by California and Florida. In total, SSA state-level files list Caio in 3 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Caio 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 687 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.