Mack vs Killian

Baby Name Comparison — 2026

Mack

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

✓ All Clear

Mack Rank #499

Killian Rank #370

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

Is Mack or Killian more popular?

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

What do Mack and Killian mean?

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

Are Mack and Killian boy or girl names?

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