How Many People Are Named Riannon?
An estimated 240 people in the United States have the first name Riannon. It is almost exclusively a female name. The average bearer is 34 years old, and Riannon peaked in popularity in 1987 with 14 births that year.
Below you will find a full statistical profile of Riannon 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 Riannon paired with any surname.
Estimated Living Americans
240
About 1 in 1,428,143 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
34
years old
Peak Year
1987
14 births
Total Registered
250
since 1880
Gender Distribution for Riannon
Riannon is almost exclusively a female name. Out of 250 total births registered, 100.0% were female.
Riannon as a female name
Ranked #14,796 in 2006
7 female births in 2006
Peak: 1987 (14 births)
Riannon: Popularity Over Time
SSA records for Riannon span from the 1970s to the 2000s, covering 4 decades of naming data. The most popular decade for this name was the 1990s, when 82 babies were registered. While Riannon is less common than at its peak in the 1990s, it remains a well-established name with steady registrations.
Riannon by Decade
How has Riannon 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.
Riannon + Last Name Combinations
How many people share a full name with Riannon as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Riannon
Other first names starting with R with a similar number of bearers.
Riannon: Questions and Answers
How many people in the U.S. are named Riannon?
We estimate approximately 240 people named Riannon 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 1,428,143 Americans share this first name.
Is Riannon a common name?
Riannon is classified as "Very Rare" and is more popular than 76.6% of all first names in the SSA database. A total of 250 births have been registered with this name since 1880.
When was Riannon most popular?
Riannon reached peak popularity in 1987, when 14 babies were given this name. The average age of a living person named Riannon is approximately 34 years old, reflecting when the name was most commonly given.
Is Riannon a female name?
Riannon is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Riannon Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Riannon Smith, Riannon Johnson, Riannon 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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