Is Lyllian a boy or girl name?

Lyllian is a girl’s name. Of the 635 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Lyllian

Recorded 1923–2025 · United States

Lyllian was most popular in 2009, when 45 American babies were given the name — ranking #6,141 that year. In 2025 it ranked #24,763, with 5 births. Across 1880–2025 the Social Security Administration has recorded 635 people named Lyllian.

Lyllian over time

Births per year. The dot marks Lyllian’s peak in 2009. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Lyllian a boy’s or a girl’s name?

Across the whole record Lyllian is a girl’s name — 100.0% of the 635 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% 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 Lyllian

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See Lyllian on the interactive charts

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