Theo Boy
How popular is Theo?
#82 boy name in 2025
3,945 baby boys were named Theo in the US in 2025, making it the 82nd most popular boy name. Another 21 girls got the name (#5,721 for girls).
33,410living people named Theo (est.)
5median age of people named Theo
39,333babies named Theo since 1880
1 in 836US babies born in 2025
Theo popularity over time
Boys Girls
| Rank in 2025 | #82 for boys (▼ 2 from 2024) |
|---|---|
| Babies in 2025 | 3,945 boys, 21 girls |
| 10-year trend | Rising fast (+416% babies vs 2015) |
| Earlier ranks | #405 in 2015, #172 in 2020 |
| Peak year | 2023 (4,140 boys) |
| Highest rank | #78 in 2023 |
| First recorded | 1880 |
| Boys vs girls (last 10 years) | 99% boys, 1% girls |
| Chance a classmate shares it | 3% in a class of 25 kids born in 2025 |
Where Theo is most popular
Babies named Theo per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
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- Hawaii: 5.8 per 1,000 (90 boys)
- North Dakota: 5.2 per 1,000 (89 boys)
- Massachusetts: 5.1 per 1,000 (707 boys)
- Maine: 5.1 per 1,000 (99 boys)
- Rhode Island: 4.9 per 1,000 (80 boys)
Theo by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1880s | 93 | #479 |
| 1890s | 118 | #523 |
| 1900s | 226 | #401 |
| 1910s | 714 | #461 |
| 1920s | 980 | #592 |
| 1930s | 680 | #643 |
| 1940s | 440 | #846 |
| 1950s | 371 | #1,051 |
| 1960s | 323 | #1,144 |
| 1970s | 386 | #1,111 |
| 1980s | 540 | #1,002 |
| 1990s | 600 | #1,365 |
| 2000s | 1,386 | #1,012 |
| 2010s | 8,189 | #195 |
| 2020s | 20,784 | #78 |
Boy names about as popular as Theo
Questions
- Is Theo a boy or girl name?
- Theo is mostly a boy name. Over the last 10 years, 99% of babies named Theo were boys.
- How popular is the name Theo?
- 3,945 baby boys were named Theo in the US in 2025, making it the 82nd most popular boy name. Another 21 girls got the name (#5,721 for girls).
- When was Theo most popular?
- Theo peaked in 2023, when 4,140 boys were given the name. Its highest rank was #78 in 2023.
- How many people are named Theo?
- 39,333 babies have been named Theo in the US since 1880. We estimate about 33,410 of them are alive in 2026, with a median age of 5.
- Where is Theo most popular?
- From 2021 to 2025, Theo was most common in Hawaii, at 5.8 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.