Rex vs Jack

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #15 Most Popular 1 Syllable

"supplanter"

Origin: Hebrew

English Irish American Australian

✓ All Clear

Rex Rank #793

Jack Rank #15

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

Is Rex or Jack more popular?

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

What do Rex and Jack mean?

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

Are Rex and Jack boy or girl names?

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