Rex vs Casen

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #794 Most Popular 2 Syllables

"alert, watchful"

Origin: Irish Gaelic

American English

✓ All Clear

Rex Rank #793

Casen Rank #794

Rex is more popular, ranked #793 vs #794 for Casen.

Is Rex or Casen more popular?

Rex is more popular, ranked #793 compared to Casen at #794 in the United States.

What do Rex and Casen mean?

Rex means "king" (Latin origin). Casen means "alert, watchful" (Irish Gaelic origin).

Are Rex and Casen boy or girl names?

Rex is primarily a boy name. Casen is primarily a boy name.