Cillian vs Sullivan

Baby Name Comparison — 2026

Cillian

Boy #464 Most Popular 3 Syllables

"strife, war"

Origin: Old Irish

Irish Celtic

✓ All Clear

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Cillian Rank #464

Sullivan Rank #340

Sullivan is more popular, ranked #340 vs #464 for Cillian.

Is Cillian or Sullivan more popular?

Sullivan is more popular, ranked #340 compared to Cillian at #464 in the United States.

What do Cillian and Sullivan mean?

Cillian means "strife, war" (Old Irish origin). Sullivan means "descendant of the dark one" (Irish Gaelic origin).

Are Cillian and Sullivan boy or girl names?

Cillian is primarily a boy name. Sullivan is primarily a boy name.