How Many People Are Named Rhiannon?
An estimated 14,793 people in the United States have the first name Rhiannon. It is almost exclusively a female name. The average bearer is 29 years old, and Rhiannon peaked in popularity in 1999 with 651 births that year.
Below you will find a full statistical profile of Rhiannon 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 Rhiannon paired with any surname.
Estimated Living Americans
14,793
About 1 in 23,170 people in the U.S.
Rarity
Uncommon
Predicted Gender
Female
100.0% confidence
Average Age
29
years old
Peak Year
1999
651 births
Total Registered
15,330
since 1880
Gender Distribution for Rhiannon
Rhiannon is almost exclusively a female name. Out of 15,330 total births registered, 100.0% were female.
Rhiannon as a male name
Ranked #7,143 in 1982
5 male births in 1982
Peak: 1982 (5 births)
Rhiannon as a female name
Ranked #1,310 in 2024
175 female births in 2024
Peak: 1999 (651 births)
Rhiannon in the 2020 Census
The 2020 Census recorded 12,801 people with the first name Rhiannon, which placed it at #2,100 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, Rhiannon was recorded as predominantly female. Out of 12,801 people with this name in that snapshot, 0.2% were male and 99.8% 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
12,801
people with this name
Census Rank
#2,100
among Census first names
Frequency Rate
4.24
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Rhiannon was most commonly recorded among people who identified as White (78.96%). The next largest recorded groups were Hispanic (10.28%) and Two or More Races (6.54%).
These percentages describe the people who had the first name Rhiannon 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 Rhiannon.
| Group | Share | Count |
|---|---|---|
| White | 78.96% | 10,115 |
| Hispanic | 10.28% | 1,317 |
| Two or More Races | 6.54% | 838 |
| American Indian and Alaska Native | 2.15% | 276 |
| Black | 1.35% | 173 |
| Asian and Pacific Islander | 0.71% | 91 |
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.
Rhiannon: Popularity Over Time
SSA records for Rhiannon span from the 1970s to the 2020s, covering 6 decades of naming data. The most popular decade for this name was the 2000s, when 4,075 babies were registered. Rhiannon has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Rhiannon by Decade
How has Rhiannon 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.
Rhiannon by State
Birth registrations for Rhiannon span all 46 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in New Hampshire, Wyoming, South Dakota. On average, about 276 Rhiannons were registered per state.
Rhiannon + Last Name Combinations
How many people share a full name with Rhiannon as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Rhiannon
Other first names starting with R with a similar number of bearers.
Rhiannon: Questions and Answers
How many people in the U.S. are named Rhiannon?
We estimate approximately 14,793 people named Rhiannon 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 23,170 Americans share this first name.
Is Rhiannon a common name?
Rhiannon is classified as "Uncommon" and is more popular than 98.2% of all first names in the SSA database. A total of 15,330 births have been registered with this name since 1880.
When was Rhiannon most popular?
Rhiannon reached peak popularity in 1999, when 651 babies were given this name. The average age of a living person named Rhiannon is approximately 29 years old, reflecting when the name was most commonly given.
How common was Rhiannon in the 2020 Census?
The 2020 Census recorded 12,801 people with the first name Rhiannon. That placed it at #2,100 in the published Census first-name tables, or 4.24 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 Rhiannon 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 Rhiannon?
In the 2020 Census snapshot, Rhiannon was recorded as predominantly female. The published split was 0.2% male and 99.8% female.
What does the Census say about the background of people named Rhiannon?
In the 2020 Census, the first name Rhiannon was most commonly recorded among people who identified as White (78.96%). The next largest recorded groups were Hispanic (10.28%) and Two or More Races (6.54%). 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 Rhiannon a female name?
Rhiannon is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
Why can Rhiannon 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. Rhiannon peaked in 1999, and the average living bearer is about 29 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Rhiannon Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Rhiannon Smith, Rhiannon Johnson, Rhiannon 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.
Search for a full name combination
How Many of Me