Mack vs Cillian

Baby Name Comparison — 2026

Mack

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Boy #464 Most Popular 3 Syllables

"strife, war"

Origin: Old Irish

Irish Celtic

✓ All Clear

Mack Rank #499

Cillian Rank #464

Cillian is more popular, ranked #464 vs #499 for Mack.

Is Mack or Cillian more popular?

Cillian is more popular, ranked #464 compared to Mack at #499 in the United States.

What do Mack and Cillian mean?

Mack means "son of" (Scottish Gaelic origin). Cillian means "strife, war" (Old Irish origin).

Are Mack and Cillian boy or girl names?

Mack is primarily a boy name. Cillian is primarily a boy name.