Rex vs Mack

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Rex Rank #793

Mack Rank #499

Mack is more popular, ranked #499 vs #793 for Rex.

Is Rex or Mack more popular?

Mack is more popular, ranked #499 compared to Rex at #793 in the United States.

What do Rex and Mack mean?

Rex means "king" (Latin origin). Mack means "son of" (Scottish Gaelic origin).

Are Rex and Mack boy or girl names?

Rex is primarily a boy name. Mack is primarily a boy name.