An estimated 16,041 living Americans are named Killian.
How rare is Killian?
Killian is moderately uncommon among babies today, with 770 boys receiving the name in 2025, down 48.9% from its 2017 peak.
How old is the typical Killian?
The median age of a living American named Killian is approximately 9 years, with most bearers falling between 5 and 13 years old.
Is Killian still popular?
Not especially. Killian has been declining since its 2017 peak and registered 770 births in 2025.
Where is Killian most common?
Killian has its strongest geographic signal in Alaska, where it appears 4.6× more often than the national baseline.
1915Peak 20172025
Peak year
2017
Decline from peak
48.9%
2025
770
All-time
16,219
Diaspora map
Killian spread fast — broke out in Alaska, Connecticut, Hawaii, Idaho, Iowa, Kentucky, Maine, Montana, New Hampshire, New Mexico, North Dakota, Ohio, Oregon, and West Virginia (2015) and ran high in 35 states within a decade.
Broke out: Alaska, Connecticut, Hawaii, Idaho, Iowa, Kentucky, Maine, Montana, New Hampshire, New Mexico, North Dakota, Ohio, Oregon, and West Virginia, 2015 · over-represented in 35 states over 8 years
