Marilou
Girl name · American · English
- US rank
- Unranked
- Syllables
- 3
- Peak
- #769 in 1933
0 babies were named Marilou in the US in 2025.
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US births per million girls, 1915–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Marilou you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- HistoryMarilou first shows up in US birth records in 1915, the first year at least 5 babies got it. It has been in use for 110 years since.
- Best yearIts best year was 1933, when it reached #769.
About the name Marilou
Marilou is a girl name of American and English origin. It has 7 letters and 3 syllables, starting with M and ending in “-lou”. US birth records list Marilou for girls from 1915 to 2024, in 101 of those 110 years. Its best year was 1933, when it ranked #769 among girl names. It hasn't been given to 5 or more US babies in a year since 2024, so today it's a genuinely rare choice.
Origin:American namesEnglish names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1910s | 12 | 85,324 girls |
| 1920s | 32 | 31,387 girls |
| 1930s | 58 | 17,227 girls |
| 1940s | 51 | 19,751 girls |
| 1950s | 37 | 27,330 girls |
| 1960s | 16 | 63,654 girls |
| 1970s | 9.2 | 109,051 girls |
| 1980s | 6.2 | 161,290 girls |
| 1990s | 4.5 | 223,714 girls |
| 2000s | 2.6 | 390,625 girls |
| 2010s | 2.5 | 403,226 girls |
| 2020s | 3.9 | 256,410 girls |
Other spellings of Marilou
More American girl names
- Girl name: Lainey · possibly light
- Girl name: Daisy · day's eye
- Girl name: Josie · he will add
- Unisex name: Kinsley · king's meadow
- Girl name: Sienna · from Siena
- Unisex name: Brooklyn · from Brooklyn, New York
- Girl name: Summer · summer
- Unisex name: Stevie · crown
Questions about the name Marilou
What is the origin of the name Marilou?
Marilou has American, English roots in our records. Other American names include Lainey, Daisy, Josie.
Is Marilou a boy or girl name?
Marilou is a girl name.
How popular is the name Marilou?
Marilou is rare: fewer than 5 US girls got it in 2025, and it was last given to 5 or more in 2024. It peaked at #769 in 1933.