How Many People Are Named Reilly?
An estimated 9,807 people in the United States have the first name Reilly. It is used for both genders, with 54.8% female. The average bearer is 22 years old, and Reilly peaked in popularity in 1997 with 543 births that year.
Below you will find a full statistical profile of Reilly 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 Reilly paired with any surname.
Key Insights
- Reilly is a genuinely unisex name, given to both boys and girls in roughly equal numbers.
Estimated Living Americans
9,807
About 1 in 34,950 people in the U.S.
Rarity
Rare
Predicted Gender
Female
54.8% confidence
Average Age
22
years old
Peak Year
1997
543 births
Total Registered
9,977
since 1880
Gender Distribution for Reilly
Reilly is a genuinely unisex name, used for both males (45.2%) and females (54.8%). Out of 9,977 total births registered, 4,510 were male and 5,467 were female.
Reilly as a male name
Ranked #2,816 in 2024
46 male births in 2024
Peak: 2007 (218 births)
Reilly as a female name
Ranked #2,730 in 2024
63 female births in 2024
Peak: 1998 (379 births)
Reilly: Popularity Over Time
SSA records for Reilly span from the 1950s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2000s, when 4,352 babies were registered. Reilly has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Reilly by Decade
How has Reilly 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.
Reilly by State
Birth registrations for Reilly span all 36 states and territories in the SSA database. The highest counts are in California, New York, Pennsylvania. The lowest are in Nevada, Nebraska, Montana. On average, about 172 Reillys were registered per state.
Reilly + Last Name Combinations
How many people share a full name with Reilly as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Reilly
Other first names starting with R with a similar number of bearers.
Reilly: Questions and Answers
How many people in the U.S. are named Reilly?
We estimate approximately 9,807 people named Reilly 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 34,950 Americans share this first name.
Is Reilly a common name?
Reilly is classified as "Rare" and is more popular than 97.7% of all first names in the SSA database. A total of 9,977 births have been registered with this name since 1880.
When was Reilly most popular?
Reilly reached peak popularity in 1997, when 543 babies were given this name. The average age of a living person named Reilly is approximately 22 years old, reflecting when the name was most commonly given.
Is Reilly a female name?
Reilly is predominantly female. 54.8% of people with this name are female. See the gender breakdown above for full details.
How many Reilly Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Reilly Smith, Reilly Johnson, Reilly 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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