Si — boys' name

What the Data Says About Si

The Social Security Administration has registered 166 babies named Si between 1927 and 2017, spanning 91 consecutive years of U.S. birth records. As a boy's name, Si currently falls outside the top 1,000 boys' names for 2017. The name reached its historical peak in 2013, when 15 babies received it in a single year. Si is classified as unisex in SSA records: the opposite-sex variant accounts for 19 additional births since 2006.

Decade-level aggregation shows that Si performed strongest in the 2010s, accumulating 39 births during that ten-year window. Across the 9 decades of recorded activity, Si shows a stable profile with only moderate drift from its peak decade.

No etymological entry is currently available for Si 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 166 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.