Masculine dossier · first seen 1960
Thelonious
Stable
Cross-generational persistence
Peak era
2017
Peak births
23
Current vitality
Rare
Peak generation
Gen Alpha
Quick answers about Thelonious
How many people are named Thelonious?
An estimated 452 living Americans are named Thelonious.
How rare is Thelonious?
Thelonious is very rare among babies today, with 12 boys receiving the name in 2025, down 47.8% from its 2017 peak.
How old is the typical Thelonious?
The median age of a living American named Thelonious is approximately 14 years, with most bearers falling between 8 and 25 years old.
Is Thelonious still popular?
Yes. Thelonious is holding steady, with 12 births in 2025 and a consistent recent baseline.
1960Peak 20172025
Peak year
2017
Decline from peak
47.8%
2025
12
All-time
467