Kellan vs Rex

Baby Name Comparison — 2026

Kellan

Boy #919 Most Popular 2 Syllables

"slender, bright-headed"

Origin: Irish Gaelic

Irish Scottish American

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Kellan Rank #919

Rex Rank #793

Rex is more popular, ranked #793 vs #919 for Kellan.

Is Kellan or Rex more popular?

Rex is more popular, ranked #793 compared to Kellan at #919 in the United States.

What do Kellan and Rex mean?

Kellan means "slender, bright-headed" (Irish Gaelic origin). Rex means "king" (Latin origin).

Are Kellan and Rex boy or girl names?

Kellan is primarily a boy name. Rex is primarily a boy name.