Is Lillis a boy or girl name?

Lillis is a girl’s name. Of the 637 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Lillis

Recorded 1880–1963 · United States

Lillis was most popular in 1919, when 25 American babies were given the name — ranking #2,910 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 637 people named Lillis.

Lillis over time

Births per year. The dot marks Lillis’s peak in 1919. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Lillis a boy’s or a girl’s name?

Across the whole record Lillis is a girl’s name — 100.0% of the 637 Americans given it were girls and 0.0% were boys.

Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.

Names that peaked alongside Lillis

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See Lillis on the interactive charts

Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org