How Many People Are Named Marylou?
An estimated 6,549 people in the United States have the first name Marylou. It is almost exclusively a female name. The average bearer is 63 years old, and Marylou peaked in popularity in 1942 with 376 births that year.
Below you will find a full statistical profile of Marylou as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Marylou paired with any surname.
Estimated Living Americans
6,549
About 1 in 52,337 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
63
years old
Peak Year
1942
376 births
Total Registered
13,084
since 1880
Gender Distribution for Marylou
Marylou is almost exclusively a female name. Out of 13,084 total births registered, 100.0% were female.
Marylou as a female name
Ranked #4,967 in 2024
27 female births in 2024
Peak: 1942 (376 births)
Marylou: Popularity Over Time
SSA records for Marylou span from the 1890s to the 2020s, covering 14 decades of naming data. The most popular decade for this name was the 1940s, when 3,141 babies were registered. Marylou has declined significantly from its peak in the 1940s. Recent registrations are a fraction of what they were at the name's height.
Marylou by Decade
How has Marylou tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Marylou by State
Birth registrations for Marylou span all 32 states and territories in the SSA database. The highest counts are in New York, California, Pennsylvania. The lowest are in South Dakota, Oregon, Montana. On average, about 305 Marylous were registered per state.
Marylou + Last Name Combinations
How many people share a full name with Marylou as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Marylou
Other first names starting with M with a similar number of bearers.
Marylou: Questions and Answers
How many people in the U.S. are named Marylou?
We estimate approximately 6,549 people named Marylou are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 52,337 Americans share this first name.
Is Marylou a common name?
Marylou is classified as "Rare" and is more popular than 97.1% of all first names in the SSA database. A total of 13,084 births have been registered with this name since 1880.
When was Marylou most popular?
Marylou reached peak popularity in 1942, when 376 babies were given this name. The average age of a living person named Marylou is approximately 63 years old, reflecting when the name was most commonly given.
Is Marylou a female name?
Marylou is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Marylou Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Marylou Smith, Marylou Johnson, Marylou Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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