Rhiannon Jajoo
There are approximately 1 people named Rhiannon Jajoo living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 342,754,338 Americans.
This estimate combines SSA birth records for the first name Rhiannon with Census Bureau frequency data for the surname Jajoo. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
1
1 in 342,754,338
Named Rhiannon
15K
Alive today
Named Jajoo
183
Alive today
US population
343M
Denominator
Estimated living: 15K
Rarity: Uncommon
Gender: Female
Peak year: 1999
Average age: 29
Top Census group: White (79.0%)
Estimated bearers: 183
Rarity: Very Rare
Census rank: #115,686
Per 100K: 0.05
Top ancestry: Asian/Pacific Islander (87.5%)
First name trend
Rhiannon: popularity over time
Year-by-year SSA birth registrations for the first name Rhiannon. The peak year was 1999 with 651 births. The average person named Rhiannon today is 29 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Rhiannon
Self-reported race and ethnicity breakdown for people with the first name Rhiannon, from the 2020 US Census Bureau first-name tables. The largest published group is White at 79.0%.
The bar chart below shows how people with the first name Rhiannon described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the name Rhiannon at the time of the Census. A first name does not determine a person's race or ethnicity.
- White79.0% · 10,115
- Hispanic or Latino10.3% · 1,317
- Two or more races6.5% · 838
- American Indian and Alaska Native2.2% · 276
- Black or African American1.4% · 173
- Asian and Pacific Islander0.7% · 91
Ethnicity
Ancestry of the Jajoo surname
Self-reported race and ethnicity breakdown for people with the surname Jajoo, from the 2020 US Census Bureau. The largest group is Asian/Pacific Islander at 87.5%.
The bar chart below shows how people with the surname Jajoo described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the surname Jajoo at the time of the Census. A surname does not determine a person's race or ethnicity.
- Asian and Pacific Islander87.5% · 140
- White8.8% · 14
- Two or more races2.5% · 4
- Black or African American0.6% · 1
- American Indian and Alaska Native0.6% · 1
Methodology
How we calculated this
The first name Rhiannon has a living-bearer frequency of 0.0043% of the US population, based on 14,793 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
Even though the Census Bureau now publishes first-name tables, we do not use that file as the main first-name input for this estimate. The latest first-name Census snapshot is from 2020, which makes it 6 years old today. Because Census first-name data is only released once every 10 years, SSA birth records plus CDC survival rates give a better current estimate of how many people are likely alive with the name Rhiannon right now.
The surname Jajoo appears at a rate of 0.05 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0001%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 1 people with the full name Rhiannon Jajoo. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Rhiannon
FAQ
Rhiannon Jajoo: questions and answers
How many people are named Rhiannon Jajoo?
We estimate approximately 1 people in the United States share the full name Rhiannon Jajoo. That works out to about 1 in 342,754,338 Americans. This is calculated by combining the first-name frequency (0.0043%) with the surname frequency (0.05 per 100K) against the current US population.
How rare is the name Rhiannon Jajoo?
We classify Rhiannon Jajoo as "Very Rare". About 1 in 342,754,338 Americans share this exact first and last name combination.
Is Rhiannon a male or female name?
Rhiannon is predominantly female. Out of 15,330 total SSA registrations, 0.0% were male and 100.0% were female. See the full Rhiannon profile for detailed gender data.
Where does this data come from?
First-name data comes from the Social Security Administration's national baby name files (1880 to 2024). Surname data comes from the 2020 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.
How many people have the full name Rhiannon Jajoo?
See how common the name Rhiannon Jajoo is on HowManyOfMe.org, our sister site built around that single question.