Masculine dossier · first seen 1995

Cillian

Rising Gaining cultural share
Peak era
2024
Peak births
668
Current vitality
Fragile
Peak generation
Gen Alpha
1995Peak 20242025
peak 2024 2025 18801900192019401960198020002020

Quick answers about Cillian

How many people are named Cillian?

An estimated 4,050 living Americans are named Cillian.

How rare is Cillian?

Cillian is moderately uncommon among babies today, with 595 boys receiving the name in 2025, down 10.9% from its 2024 peak.

How old is the typical Cillian?

The median age of a living American named Cillian is approximately 4 years, with most bearers falling between 2 and 9 years old.

Is Cillian still popular?

Yes — Cillian is currently rising in popularity, with 595 births in 2025. Births this decade are running about 5.1× higher than the previous decade.

Where is Cillian most common?

Cillian has its strongest geographic signal in Massachusetts, where it appeared 3.1× more often than the national baseline in the 2020s.

Peak year
2024
Decline from peak
10.9%
2025
595
All-time
4,084
Diaspora map

Cillian spread fast — broke out in Massachusetts and New York (2022) and ran high in 4 states within a decade.

Broke out: Massachusetts and New York, 2022 · over-represented in 4 states over 2 years

Alabama: no breakout AL Alaska: no breakout AK Arizona: no breakout AZ Arkansas: no breakout AR California: no breakout CA Colorado: broke out 2024 CO Connecticut: no breakout CT Delaware: no breakout DE District of Columbia: no breakout DC Florida: no breakout FL Georgia: no breakout GA Hawaii: no breakout HI Idaho: no breakout ID Illinois: no breakout IL Indiana: no breakout IN Iowa: no breakout IA Kansas: no breakout KS Kentucky: no breakout KY Louisiana: no breakout LA Maine: no breakout ME Maryland: no breakout MD Massachusetts: broke out 2022 MA Michigan: no breakout MI Minnesota: no breakout MN Mississippi: no breakout MS Missouri: no breakout MO Montana: no breakout MT Nebraska: no breakout NE Nevada: no breakout NV New Hampshire: no breakout NH New Jersey: no breakout NJ New Mexico: no breakout NM New York: broke out 2022 NY North Carolina: no breakout NC North Dakota: no breakout ND Ohio: no breakout OH Oklahoma: no breakout OK Oregon: no breakout OR Pennsylvania: broke out 2024 PA Rhode Island: no breakout RI South Carolina: no breakout SC South Dakota: no breakout SD Tennessee: no breakout TN Texas: no breakout TX Utah: no breakout UT Vermont: no breakout VT Virginia: no breakout VA Washington: no breakout WA West Virginia: no breakout WV Wisconsin: no breakout WI Wyoming: no breakout WY