Jack vs Rex

Baby Name Comparison — 2026

Jack

Boy #15 Most Popular 1 Syllable

"supplanter"

Origin: Hebrew

English Irish American Australian

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Jack Rank #15

Rex Rank #793

Jack is more popular, ranked #15 vs #793 for Rex.

Is Jack or Rex more popular?

Jack is more popular, ranked #15 compared to Rex at #793 in the United States.

What do Jack and Rex mean?

Jack means "supplanter" (Hebrew origin). Rex means "king" (Latin origin).

Are Jack and Rex boy or girl names?

Jack is primarily a boy name. Rex is primarily a boy name.