Rex vs Casper

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #881 Most Popular 2 Syllables

"treasurer, keeper of treasure"

Origin: Persian

Dutch Scandinavian German English

✓ All Clear

Rex Rank #793

Casper Rank #881

Rex is more popular, ranked #793 vs #881 for Casper.

Is Rex or Casper more popular?

Rex is more popular, ranked #793 compared to Casper at #881 in the United States.

What do Rex and Casper mean?

Rex means "king" (Latin origin). Casper means "treasurer, keeper of treasure" (Persian origin).

Are Rex and Casper boy or girl names?

Rex is primarily a boy name. Casper is primarily a boy name.