How Many People Are Named Theo?
people named Theo are alive in the United States today (estimate)
About 1 in 10,283 people in the US has this name
Based on 39,333 babies named Theo in Social Security records from 1880 to 2025, and the share of each birth year still alive in 2025.
Popularity Rank
💎 Rare
Peak Year
4,182 births
Trend
Rising (last 10 years)
📖 Name Origin & Meaning
Meaning:
Short form of THEODORE, THEOBALD, and other names that begin with Theo.
Source of the meaning, origin, pronunciation and related names: Behind the Name.
⚧ Gender Distribution
Of the babies given the name Theo, 2.5% were girls and 97.5% were boys. The share of girls among babies named Theo fell from 57.9% in the 1880s to 1.2% in the 2020s.
👥 Age Distribution
The average person named Theo alive today is about 9 years old, and 92% are under 30. Half of them were between 2 and 8 in 2025.
📈 Popularity Over Time
Theo first appears in the records in 1880 and was given most often in 2023, to 4,182 babies. In 2025, 3,966 babies got the name. Over the last ten years, the number each year has been rising.
Babies given the name each year, 1880 to 2025
🏆 Rank History
Theo never made the top 10 boys' names. Its best rank was #78, in 2023, and it was in the top 100 for 4 years, 2022 to 2025. In 2025 it ranked #82.
| Boys | |
|---|---|
| Rank in 2025 | #82 |
| Best rank | #78 (2023) |
| Years in the top 100 | 4 (2022 to 2025) |
| Rank in its biggest decade | #105 in the 2020s |
📍 State-Wise Distribution
People named Theo alive today, by the state where they were born (estimate; state records start in 1910).
More people named Theo were born in California than in any other state: about 3,912 of those alive today. Compared with the national rate in the same years, Theo was given 2.1 times as often in Massachusetts, 1.8 times in Hawaii and 1.7 times in District of Columbia.
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