Allan vs Rex

Baby Name Comparison — 2026

Allan

Boy #854 Most Popular 2 Syllables

"rock, harmony"

Origin: Celtic/Brythonic

Scottish English French American

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Allan Rank #854

Rex Rank #793

Rex is more popular, ranked #793 vs #854 for Allan.

Is Allan or Rex more popular?

Rex is more popular, ranked #793 compared to Allan at #854 in the United States.

What do Allan and Rex mean?

Allan means "rock, harmony" (Celtic/Brythonic origin). Rex means "king" (Latin origin).

Are Allan and Rex boy or girl names?

Allan is primarily a boy name. Rex is primarily a boy name.