How Many People Are Named Rex?
An estimated 37,623 people in the United States have the first name Rex. It is almost exclusively a male name. The average bearer is 54 years old, and Rex peaked in popularity in 1952 with 1,505 births that year.
Below you will find a full statistical profile of Rex 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 Rex paired with any surname.
Key Insights
- While Rex is overwhelmingly male, 141 female births have been registered with this name since 1880.
Estimated Living Americans
37,623
About 1 in 9,110 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
99.8% confidence
Average Age
54
years old
Peak Year
1952
1,505 births
Total Registered
60,301
since 1880
Gender Distribution for Rex
Rex is almost exclusively a male name. Out of 60,301 total births registered, 99.8% were male.
Rex as a male name
Ranked #794 in 2024
316 male births in 2024
Peak: 1951 (1,503 births)
Rex as a female name
Ranked #10,051 in 1984
6 female births in 1984
Peak: 1961 (10 births)
Rex: Popularity Over Time
SSA records for Rex span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1950s, when 13,544 babies were registered. Rex has declined significantly from its peak in the 1950s. Recent registrations are a fraction of what they were at the name's height.
Rex by Decade
How has Rex 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.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 1880s | 183 | 183 | 0 | |
| 1890s | 305 | 305 | 0 | |
| 1900s | 497 | 497 | 0 | |
| 1910s | 3,253 | 3,253 | 0 | |
| 1920s | 5,660 | 5,627 | 33 | |
| 1930s | 5,961 | 5,949 | 12 | |
| 1940s | 6,680 | 6,669 | 11 | |
| 1950s | 13,544 | 13,500 | 44 | |
| 1960s | 8,755 | 8,732 | 23 | |
| 1970s | 3,367 | 3,360 | 7 | |
| 1980s | 2,544 | 2,533 | 11 | |
| 1990s | 1,741 | 1,741 | 0 | |
| 2000s | 2,048 | 2,048 | 0 | |
| 2010s | 3,944 | 3,944 | 0 | |
| 2020s | 1,819 | 1,819 | 0 | |
Rex by State
Birth registrations for Rex span all 48 states and territories in the SSA database. The highest counts are in California, Texas, Indiana. The lowest are in Rhode Island, Connecticut, Alaska. On average, about 1,140 Rexs were registered per state.
Rex + Last Name Combinations
How many people share a full name with Rex as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Rex
Other first names starting with R with a similar number of bearers.
Rex: Questions and Answers
How many people in the U.S. are named Rex?
We estimate approximately 37,623 people named Rex 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 9,110 Americans share this first name.
Is Rex a common name?
Rex is classified as "Uncommon" and is more popular than 99% of all first names in the SSA database. A total of 60,301 births have been registered with this name since 1880.
When was Rex most popular?
Rex reached peak popularity in 1952, when 1,505 babies were given this name. The average age of a living person named Rex is approximately 54 years old, reflecting when the name was most commonly given.
Is Rex a male name?
Rex is predominantly male. 99.8% of people with this name are male. See the gender breakdown above for full details.
How many Rex Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Rex Smith, Rex Johnson, Rex 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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