Masculine dossier · first seen 1957
Kiernan
Stable
Cross-generational persistence
Peak era
2008
Peak births
77
Current vitality
Rare
Peak generation
Gen Z
Quick answers about Kiernan
How many people are named Kiernan?
An estimated 1,728 living Americans are named Kiernan.
How rare is Kiernan?
Kiernan is very rare among babies today, with 34 boys receiving the name in 2025, down 55.8% from its 2008 peak.
How old is the typical Kiernan?
The median age of a living American named Kiernan is approximately 20 years, with most bearers falling between 12 and 27 years old.
Is Kiernan still popular?
Yes. Kiernan is holding steady, with 34 births in 2025 and a consistent recent baseline.
Where is Kiernan most common?
Kiernan has its strongest geographic signal in New York, where it appears 2.0× more often than the national baseline.
1957Peak 20082025
Peak year
2008
Decline from peak
55.8%
2025
34
All-time
1,761
Where it lives now
Kiernan is most concentrated in New York — about 2.0× the national rate in the 2000s.
States where Kiernan is given more often than the national average — its present-day heartland.