How Many People Are Named Rei?
An estimated 958 people in the United States have the first name Rei. It is used for both genders, with 54.3% female. The average bearer is 13 years old, and Rei peaked in popularity in 2019 with 67 births that year.
Below you will find a full statistical profile of Rei 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 Rei paired with any surname.
Estimated Living Americans
958
About 1 in 357,781 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
54.3% confidence
Average Age
13
years old
Peak Year
2019
67 births
Total Registered
969
since 1880
Gender Distribution for Rei
Rei is a genuinely unisex name, used for both males (45.7%) and females (54.3%). Out of 969 total births registered, 443 were male and 526 were female.
Rei as a male name
Ranked #3,860 in 2024
29 male births in 2024
Peak: 2021 (34 births)
Rei as a female name
Ranked #4,980 in 2024
27 female births in 2024
Peak: 2020 (48 births)
Rei in the 2020 Census
The 2020 Census recorded 1,255 people with the first name Rei, which placed it at #10,552 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, Rei was recorded as predominantly female. Out of 1,255 people with this name in that snapshot, 44.9% were male and 55.1% were female. That is very close to the long-run birth pattern in SSA records, where the name is female 54.3% of the time.
Census Count
1,255
people with this name
Census Rank
#10,552
among Census first names
Frequency Rate
0.42
per 100,000 people
Recorded Race and Hispanic Origin in the 2020 Census
In the 2020 Census, the first name Rei was most commonly recorded among people who identified as Asian and Pacific Islander (48.39%). The next largest recorded groups were White (21.91%) and Two or More Races (15.01%).
These percentages describe the people who had the first name Rei 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 Rei.
| Group | Share | Count |
|---|---|---|
| Asian and Pacific Islander | 48.39% | 603 |
| White | 21.91% | 273 |
| Two or More Races | 15.01% | 187 |
| Hispanic | 10.67% | 133 |
| Black | 3.85% | 48 |
| American Indian and Alaska Native | 0.16% | 2 |
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.
Rei: Popularity Over Time
SSA records for Rei span from the 1970s to the 2020s, covering 6 decades of naming data. The most popular decade for this name was the 2010s, when 384 babies were registered. While Rei is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Rei by Decade
How has Rei 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.
Rei by State
Birth registrations for Rei span all 4 states and territories in the SSA database. The highest counts are in California, New York, Texas. The lowest are in Pennsylvania, Texas, New York. On average, about 51 Reis were registered per state.
Rei + Last Name Combinations
How many people share a full name with Rei as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Rei
Other first names starting with R with a similar number of bearers.
Rei: Questions and Answers
How many people in the U.S. are named Rei?
We estimate approximately 958 people named Rei 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 357,781 Americans share this first name.
Is Rei a common name?
Rei is classified as "Very Rare" and is more popular than 89.8% of all first names in the SSA database. A total of 969 births have been registered with this name since 1880.
When was Rei most popular?
Rei reached peak popularity in 2019, when 67 babies were given this name. The average age of a living person named Rei is approximately 13 years old, reflecting when the name was most commonly given.
How common was Rei in the 2020 Census?
The 2020 Census recorded 1,255 people with the first name Rei. That placed it at #10,552 in the published Census first-name tables, or 0.42 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 Rei 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 Rei?
In the 2020 Census snapshot, Rei was recorded as predominantly female. The published split was 44.9% male and 55.1% female.
What does the Census say about the background of people named Rei?
In the 2020 Census, the first name Rei was most commonly recorded among people who identified as Asian and Pacific Islander (48.39%). The next largest recorded groups were White (21.91%) and Two or More Races (15.01%). 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 Rei a female name?
Rei is predominantly female. 54.3% of people with this name are female. See the gender breakdown above for full details.
Why can Rei 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. Rei peaked in 2019, and the average living bearer is about 13 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Rei Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Rei Smith, Rei Johnson, Rei 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