Rex vs Trey

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #790 Most Popular 1 Syllable

"three, the third"

Origin: Old French

American English

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Rex Rank #793

Trey Rank #790

Trey is more popular, ranked #790 vs #793 for Rex.

Is Rex or Trey more popular?

Trey is more popular, ranked #790 compared to Rex at #793 in the United States.

What do Rex and Trey mean?

Rex means "king" (Latin origin). Trey means "three, the third" (Old French origin).

Are Rex and Trey boy or girl names?

Rex is primarily a boy name. Trey is primarily a boy name.