Feminine dossier · first seen 1968
Cailin
Stable Decline
Gradual decline from 2003
Peak era
2003
Peak births
164
Current vitality
Rare
Peak generation
Gen Z
Quick answers about Cailin
How many people are named Cailin?
An estimated 3,634 living Americans are named Cailin.
How rare is Cailin?
Cailin is very rare among babies today, with 7 girls receiving the name in 2025, down 95.7% from its 2003 peak.
How old is the typical Cailin?
The median age of a living American named Cailin is approximately 24 years, with most bearers falling between 18 and 31 years old.
Is Cailin still popular?
Not especially. Cailin has been declining since its 2003 peak and registered 7 births in 2025.
Where is Cailin most common?
Cailin has its strongest geographic signal in Massachusetts, where it appears 2.9× more often than the national baseline.
1968Peak 20032025
Peak year
2003
Decline from peak
95.7%
2025
7
All-time
3,713
Where it lives now
Cailin is most concentrated in Massachusetts — about 2.4× the national rate in the 2000s.
States where Cailin is given more often than the national average — its present-day heartland.