Feminine dossier · first seen 1978
Reilly
Stable Decline
Gradual decline from 1998
Peak era
1998
Peak births
379
Current vitality
Rare
Peak generation
Gen Z
Quick answers about Reilly
How many people are named Reilly?
An estimated 5,435 living Americans are named Reilly.
How rare is Reilly?
Reilly is uncommon among babies today, with 60 girls receiving the name in 2025, down 84.2% from its 1998 peak.
How old is the typical Reilly?
The median age of a living American named Reilly is approximately 23 years, with most bearers falling between 16 and 27 years old.
Is Reilly still popular?
Not especially. Reilly has been declining since its 1998 peak and registered 60 births in 2025.
Where is Reilly most common?
Reilly has its strongest geographic signal in New Jersey, where it appears 2.7× more often than the national baseline.
1978Peak 19982025
Peak year
1998
Decline from peak
84.2%
2025
60
All-time
5,528