How Many People Are Named Marilu?
An estimated 1,869 people in the United States have the first name Marilu. It is almost exclusively a female name. The average bearer is 39 years old, and Marilu peaked in popularity in 1991 with 55 births that year.
Below you will find a full statistical profile of Marilu 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 Marilu paired with any surname.
Estimated Living Americans
1,869
About 1 in 183,389 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
39
years old
Peak Year
1991
55 births
Total Registered
2,263
since 1880
Gender Distribution for Marilu
Marilu is almost exclusively a female name. Out of 2,263 total births registered, 100.0% were female.
Marilu as a female name
Ranked #7,432 in 2024
15 female births in 2024
Peak: 1991 (55 births)
Marilu: Popularity Over Time
SSA records for Marilu span from the 1910s to the 2020s, covering 12 decades of naming data. The most popular decade for this name was the 1990s, when 443 babies were registered. Marilu has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Marilu by Decade
How has Marilu 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.
Marilu by State
Birth registrations for Marilu span all 6 states and territories in the SSA database. The highest counts are in California, Texas, Illinois. The lowest are in Michigan, Florida, New York. On average, about 161 Marilus were registered per state.
Marilu + Last Name Combinations
How many people share a full name with Marilu as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Marilu
Other first names starting with M with a similar number of bearers.
Marilu: Questions and Answers
How many people in the U.S. are named Marilu?
We estimate approximately 1,869 people named Marilu 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 183,389 Americans share this first name.
Is Marilu a common name?
Marilu is classified as "Rare" and is more popular than 93.4% of all first names in the SSA database. A total of 2,263 births have been registered with this name since 1880.
When was Marilu most popular?
Marilu reached peak popularity in 1991, when 55 babies were given this name. The average age of a living person named Marilu is approximately 39 years old, reflecting when the name was most commonly given.
Is Marilu a female name?
Marilu is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Marilu Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Marilu Smith, Marilu Johnson, Marilu 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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