Lillis — girls' name

What the Data Says About Lillis

The Social Security Administration has registered 637 babies named Lillis between 1880 and 1963, spanning 84 consecutive years of U.S. birth records. As a girl's name, Lillis currently falls outside the top 1,000 girls' names for 1963. The name reached its historical peak in 1919, when 25 babies received it in a single year.

Decade-level aggregation shows that Lillis performed strongest in the 1920s, accumulating 172 births during that ten-year window. Across the 9 decades of recorded activity, Lillis shows a clear decline from its mid-century high.

No etymological entry is currently available for Lillis 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 637 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.