Thaddeus vs Rex

Baby Name Comparison — 2026

Thaddeus

Boy #850 Most Popular 3 Syllables

"courageous heart"

Origin: Aramaic

English Polish American Catholic

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Thaddeus Rank #850

Rex Rank #793

Rex is more popular, ranked #793 vs #850 for Thaddeus.

Is Thaddeus or Rex more popular?

Rex is more popular, ranked #793 compared to Thaddeus at #850 in the United States.

What do Thaddeus and Rex mean?

Thaddeus means "courageous heart" (Aramaic origin). Rex means "king" (Latin origin).

Are Thaddeus and Rex boy or girl names?

Thaddeus is primarily a boy name. Rex is primarily a boy name.