Killian vs Mack

Baby Name Comparison — 2026

Killian

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

✓ All Clear

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Killian Rank #370

Mack Rank #499

Killian is more popular, ranked #370 vs #499 for Mack.

Is Killian or Mack more popular?

Killian is more popular, ranked #370 compared to Mack at #499 in the United States.

What do Killian and Mack mean?

Killian means "associated with the church" (Irish Gaelic origin). Mack means "son of" (Scottish Gaelic origin).

Are Killian and Mack boy or girl names?

Killian is primarily a boy name. Mack is primarily a boy name.