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, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. 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 in the 2020 Census
The 2020 Census recorded 253 people with the first name Riannon, which placed it at #32,949 in the published first-name tables. This is a snapshot of people who already had the name in 2020. The estimated living count elsewhere on this page is different: it is a current estimate built from SSA birth records and age-based survival rates, so the two figures are not expected to match exactly.
Read this section as a snapshot of people who already had the name in 2020. The SSA charts elsewhere on this page are still the better way to see how the name rose, fell, or shifted across generations.
Gender in the 2020 Census
In the 2020 Census, Riannon was recorded as predominantly female. Out of 253 people with this name in that snapshot, 1.2% were male and 98.8% were female. That is very close to the long-run birth pattern in SSA records, where the name is female 100.0% of the time.
Census Count
253
people with this name
Census Rank
#32,949
among Census first names
Frequency Rate
0.08
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Riannon was most commonly recorded among people who identified as White (72.66%). The next largest recorded groups were Hispanic (11.33%) and Two or More Races (6.64%).
These percentages describe the people who had the first name Riannon in the 2020 Census. They do not tell you the deeper meaning or origin of the name itself.
2020 Census demographic breakdown
Each row shows a recorded Census category for people with the first name Riannon.
| Group | Share | Count |
|---|---|---|
| White | 72.66% | 186 |
| Hispanic | 11.33% | 29 |
| Two or More Races | 6.64% | 17 |
| Black | 3.52% | 9 |
| American Indian and Alaska Native | 3.13% | 8 |
| Asian and Pacific Islander | 2.73% | 7 |
The Census published separate sex and race/origin tables for first names, so their total counts can differ slightly for the same name. That is why the race section focuses on the demographic mix rather than repeating a second headline count.
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.
How common was Riannon in the 2020 Census?
The 2020 Census recorded 253 people with the first name Riannon. That placed it at #32,949 in the published Census first-name tables, or 0.08 people per 100,000.
Why is the Census count different from the living estimate?
Because they measure different things. The Census number is a count of people with the name in 2020. The living estimate is a current model based on SSA birth records and survival rates, so it aims to estimate how many people with the name are alive now.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Riannon was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
What does the Census say about the gender split for Riannon?
In the 2020 Census snapshot, Riannon was recorded as predominantly female. The published split was 1.2% male and 98.8% female.
What does the Census say about the background of people named Riannon?
In the 2020 Census, the first name Riannon was most commonly recorded among people who identified as White (72.66%). The next largest recorded groups were Hispanic (11.33%) and Two or More Races (6.64%). These percentages describe the people who had the name in the 2020 Census, not the deeper meaning or origin of the name itself.
Why can the Census sex total and race total differ slightly?
The Census published separate first-name tables for sex and for race and Hispanic origin. Those totals can differ slightly for the same name, so the page uses them as two related snapshots rather than treating them as perfectly interchangeable counts.
Does every first name have Census demographic data?
No. The public Census first-name tables only include names that met the Bureau's publication rules. That means some names on this site will have SSA history but no published Census demographic snapshot.
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.
Why can Riannon have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Riannon peaked in 1987, and the average living bearer is about 34 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
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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