How Many People Are Named Theo?
An estimated 29,344 people in the United States have the first name Theo. It is predominantly male (90.1%). The average bearer is 11 years old, and Theo peaked in popularity in 2023 with 4,179 births that year.
Below you will find a full statistical profile of Theo 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 Theo paired with any surname.
Key Insights
- Theo is a modern name. With an average bearer age of just 11, it has gained most of its popularity in recent years.
- Theo is experiencing a surge in popularity, with recent registrations more than doubling compared to the previous decade.
Estimated Living Americans
29,344
About 1 in 11,681 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
90.1% confidence
Average Age
11
years old
Peak Year
2023
4,179 births
Total Registered
35,340
since 1880
Gender Distribution for Theo
Theo is predominantly male (90.1%), though 3,482 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Theo as a male name
Ranked #80 in 2024
4,110 male births in 2024
Peak: 2023 (4,137 births)
Theo as a female name
Ranked #4,537 in 2024
31 female births in 2024
Peak: 1924 (111 births)
Theo: Popularity Over Time
SSA records for Theo span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 2020s, when 17,045 babies were registered. Theo remains highly popular today, with recent registration numbers near its historical peak.
Theo by Decade
How has Theo 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 | 221 | 93 | 128 | |
| 1890s | 330 | 118 | 212 | |
| 1900s | 522 | 226 | 296 | |
| 1910s | 1,447 | 714 | 733 | |
| 1920s | 1,845 | 980 | 865 | |
| 1930s | 1,045 | 680 | 365 | |
| 1940s | 766 | 440 | 326 | |
| 1950s | 545 | 371 | 174 | |
| 1960s | 389 | 322 | 67 | |
| 1970s | 405 | 386 | 19 | |
| 1980s | 540 | 540 | 0 | |
| 1990s | 605 | 600 | 5 | |
| 2000s | 1,391 | 1,386 | 5 | |
| 2010s | 8,244 | 8,188 | 56 | |
| 2020s | 17,045 | 16,814 | 231 | |
Theo by State
Birth registrations for Theo span all 51 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in Vermont, Wyoming, Alaska. On average, about 553 Theos were registered per state.
Theo + Last Name Combinations
How many people share a full name with Theo as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Theo
Other first names starting with T with a similar number of bearers.
Theo: Questions and Answers
How many people in the U.S. are named Theo?
We estimate approximately 29,344 people named Theo 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 11,681 Americans share this first name.
Is Theo a common name?
Theo is classified as "Uncommon" and is more popular than 98.8% of all first names in the SSA database. A total of 35,340 births have been registered with this name since 1880.
When was Theo most popular?
Theo reached peak popularity in 2023, when 4,179 babies were given this name. The average age of a living person named Theo is approximately 11 years old, reflecting when the name was most commonly given.
Is Theo a male name?
Theo is predominantly male. 90.1% of people with this name are male. See the gender breakdown above for full details.
How many Theo Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Theo Smith, Theo Johnson, Theo 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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