Masculine dossier · first seen 1880
Theo
Rising
Gaining cultural share
Peak era
2023
Peak births
4,140
Current vitality
Healthy
Peak generation
Gen Alpha
Quick answers about Theo
How many people are named Theo?
An estimated 32,247 living Americans are named Theo.
How rare is Theo?
Theo is moderately uncommon among babies today, with 3,945 boys receiving the name in 2025.
How old is the typical Theo?
The median age of a living American named Theo is approximately 5 years, with most bearers falling between 3 and 9 years old.
Is Theo still popular?
Yes — Theo is currently rising in popularity, with 3,945 births in 2025. Births this decade are running about 8.4× higher than the previous decade.
Where is Theo most common?
Theo has its strongest geographic signal in Arkansas, where it appears 5.3× more often than the national baseline.
1880Peak 20232025
Peak year
2023
Decline from peak
4.7%
2025
3,945
All-time
35,830
Where it lives now
Theo is most concentrated in Massachusetts — about 4.4× the national rate in the 2000s.
States where Theo is given more often than the national average — its present-day heartland.