An estimated 57,959 living Americans are named Declan.
How rare is Declan?
Declan is moderately uncommon among babies today, with 2,570 boys receiving the name in 2025, down 35.3% from its 2019 peak.
How old is the typical Declan?
The median age of a living American named Declan is approximately 9 years, with most bearers falling between 5 and 14 years old.
Is Declan still popular?
Yes. Declan is holding steady, with 2,570 births in 2025 and a consistent recent baseline.
Where is Declan most common?
Declan has its strongest geographic signal in Massachusetts, where it appears 4.9× more often than the national baseline.
1951Peak 20192025
Peak year
2019
Decline from peak
35.3%
2025
2,570
All-time
58,547
Diaspora map
Declan broke out in Connecticut, Idaho, Illinois, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont (2005) and became over-represented in 31 states over 13 years.
Broke out: Connecticut, Idaho, Illinois, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont, 2005 · over-represented in 31 states over 13 years
