Cillian vs Killian

Baby Name Comparison — 2026

Cillian

Boy #464 Most Popular 3 Syllables

"strife, war"

Origin: Old Irish

Irish Celtic

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Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

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Cillian Rank #464

Killian Rank #370

Killian is more popular, ranked #370 vs #464 for Cillian.

Is Cillian or Killian more popular?

Killian is more popular, ranked #370 compared to Cillian at #464 in the United States.

What do Cillian and Killian mean?

Cillian means "strife, war" (Old Irish origin). Killian means "associated with the church" (Irish Gaelic origin).

Are Cillian and Killian boy or girl names?

Cillian is primarily a boy name. Killian is primarily a boy name.