Quick answers about Marilou
How many people are named Marilou?
An estimated 1,369 living Americans are named Marilou.
How rare is Marilou?
Marilou fell below the SSA's 5-birth reporting floor in 2025. It is extremely rare as a new baby name.
How old is the typical Marilou?
The median age of a living American named Marilou is approximately 67 years, with most bearers falling between 50 and 75 years old.
Is Marilou still popular?
Not especially. Marilou has been declining since its 1948 peak and registered 0 births in 2025.
Where is Marilou most common?
Marilou has its strongest geographic signal in Illinois, where it appears 2.5× more often than the national baseline.
1915Peak 19482025
Where it lives now
Marilou is most concentrated in Ohio — about 1.8× the national rate in the 1940s.
States where Marilou is given more often than the national average — its present-day heartland.
3×+
2×+
1.5×+
1.2×+
~ national
