On record since 1915
Cillian
3,492 people named Cillian appear in the U.S. record since 1915. Rare enough that most people have never met one.
It peaked in the 2010s. Also spelled Killian, Killion.
U.S. RecordSocial Security, 1880 to 2024
All-time rank#5,265 of 104,819 names
People on record3,492
Peak decade2010s
First recorded1915