How Many People Are Named Milly?
An estimated 2,619 people in the United States have the first name Milly. It is almost exclusively a female name. The average bearer is 21 years old, and Milly peaked in popularity in 2014 with 129 births that year.
Below you will find a full statistical profile of Milly 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 Milly paired with any surname.
Estimated Living Americans
2,619
About 1 in 130,872 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
21
years old
Peak Year
2014
129 births
Total Registered
3,234
since 1880
Gender Distribution for Milly
Milly is almost exclusively a female name. Out of 3,234 total births registered, 100.0% were female.
Milly as a female name
Ranked #1,791 in 2024
112 female births in 2024
Peak: 2014 (129 births)
Milly: Popularity Over Time
SSA records for Milly span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 2010s, when 1,024 babies were registered. While Milly is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Milly by Decade
How has Milly 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.
Milly by State
Birth registrations for Milly span all 23 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in South Carolina, Nevada, New Jersey. On average, about 42 Millys were registered per state.
Milly + Last Name Combinations
How many people share a full name with Milly as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Milly
Other first names starting with M with a similar number of bearers.
Milly: Questions and Answers
How many people in the U.S. are named Milly?
We estimate approximately 2,619 people named Milly 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 130,872 Americans share this first name.
Is Milly a common name?
Milly is classified as "Rare" and is more popular than 94.7% of all first names in the SSA database. A total of 3,234 births have been registered with this name since 1880.
When was Milly most popular?
Milly reached peak popularity in 2014, when 129 babies were given this name. The average age of a living person named Milly is approximately 21 years old, reflecting when the name was most commonly given.
Is Milly a female name?
Milly is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Milly Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Milly Smith, Milly Johnson, Milly 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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