Mack vs Sullivan

Baby Name Comparison — 2026

Mack

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Mack Rank #499

Sullivan Rank #340

Sullivan is more popular, ranked #340 vs #499 for Mack.

Is Mack or Sullivan more popular?

Sullivan is more popular, ranked #340 compared to Mack at #499 in the United States.

What do Mack and Sullivan mean?

Mack means "son of" (Scottish Gaelic origin). Sullivan means "descendant of the dark one" (Irish Gaelic origin).

Are Mack and Sullivan boy or girl names?

Mack is primarily a boy name. Sullivan is primarily a boy name.