An estimated 15,575 living Americans are named Gillian.
How rare is Gillian?
Gillian is very rare among babies today, with 47 girls receiving the name in 2025, down 95.4% from its 1999 peak.
How old is the typical Gillian?
The median age of a living American named Gillian is approximately 27 years, with most bearers falling between 23 and 39 years old.
Is Gillian still popular?
No. Gillian is endangered as a baby name, down 95.4% from its 1999 peak with 47 births in 2025.
Peak year
1999
Decline from peak
95.4%
2025
47
All-time
16,059
Diaspora map
Gillian spread fast — broke out in Connecticut, Massachusetts, New Jersey, New York, Pennsylvania, and Washington (1996) and ran high in 9 states within a decade.
Broke out: Connecticut, Massachusetts, New Jersey, New York, Pennsylvania, and Washington, 1996 · over-represented in 9 states over 5 years
