Flynn vs Rex

Baby Name Comparison — 2026

Flynn

Boy #738 Most Popular 1 Syllable

"son of the red-haired one"

Origin: Irish Gaelic

Irish English Australian American

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Flynn Rank #738

Rex Rank #793

Flynn is more popular, ranked #738 vs #793 for Rex.

Is Flynn or Rex more popular?

Flynn is more popular, ranked #738 compared to Rex at #793 in the United States.

What do Flynn and Rex mean?

Flynn means "son of the red-haired one" (Irish Gaelic origin). Rex means "king" (Latin origin).

Are Flynn and Rex boy or girl names?

Flynn is primarily a boy name. Rex is primarily a boy name.