Is Marilou a boy or girl name?

Marilou is a girl’s name. Of the 3,231 Americans recorded with the name since 1880, 100.0% were girls and 0.0% were boys.

Name Legacy

Marilou

Recorded 1915–2024 · United States

Marilou was most popular in 1948, when 90 American babies were given the name — ranking #1,572 that year. It was not recorded in 2025. Across 1880–2025 the Social Security Administration has recorded 3,231 people named Marilou.

Marilou over time

Births per year. The dot marks Marilou’s peak in 1948. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Marilou a boy’s or a girl’s name?

Across the whole record Marilou is a girl’s name — 100.0% of the 3,231 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 Marilou

Where Marilou is most concentrated

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

Explore further

See Marilou on the interactive charts

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