Io — unisex name

What the Data Says About Io

The Social Security Administration has registered 185 babies named Io between 2000 and 2023, spanning 24 consecutive years of U.S. birth records. As a girl's name, Io currently falls outside the top 1,000 girls' names for 2023. The name reached its historical peak in 2022, when 18 babies received it in a single year. Io is classified as unisex in SSA records: the opposite-sex variant accounts for 31 additional births since 2014.

Decade-level aggregation shows that Io performed strongest in the 2010s, accumulating 96 births during that ten-year window. Across the 3 decades of recorded activity, Io 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 Io in 1 of the 51 U.S. reporting jurisdictions.

No etymological entry is currently available for Io 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 185 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.