Cillian
Cillian: name meaning, origin and popularity
How popular is Cillian?
Since 1880, 6 girls and 4,084 boys in the U.S. have been named Cillian (0% girls). Its highest rank for girls was #13845 in 2024. Its highest rank for boys was #463 in 2024. In 2025 it ranked #507 for boys, with 595 babies given the name.
Sibling name ideas for Cillian
Names that peaked around the same time as Cillian and are still in the U.S. top 1,000.
Cillian FAQ
How popular is the name Cillian?
Since 1880, 6 girls and 4,084 boys in the U.S. have been named Cillian (0% girls). Its highest rank for girls was #13845 in 2024. Its highest rank for boys was #463 in 2024. In 2025 it ranked #507 for boys, with 595 babies given the name.
Is Cillian a boy or girl name?
Cillian is mostly a boy name in the U.S.: 6 girls and 4,084 boys since 1880.
Popularity data: U.S. Social Security Administration baby name data, 1880–2025 (names given to 5+ babies per year).