Is Milly a boy or girl name?

Milly is a girl’s name. Of the 3,347 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Milly

Recorded 1884–2025 · United States

Milly was most popular in 2014, when 129 American babies were given the name — ranking #2,966 that year. In 2025 it ranked #3,252, with 113 births. Across 1880–2025 the Social Security Administration has recorded 3,347 people named Milly.

Milly over time

Births per year. The dot marks Milly’s peak in 2014. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Milly a boy’s or a girl’s name?

Across the whole record Milly is a girl’s name — 100.0% of the 3,347 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 Milly

Where Milly is most concentrated

How much more common the name is in each state than across the country as a whole.

Explore further

See Milly on the interactive charts

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