Cassian vs Rex

Baby Name Comparison — 2026

Cassian

Boy #617 Most Popular 3 Syllables

"of the Cassian family (Roman gens)"

Origin: Latin

English American European

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Cassian Rank #617

Rex Rank #793

Cassian is more popular, ranked #617 vs #793 for Rex.

Is Cassian or Rex more popular?

Cassian is more popular, ranked #617 compared to Rex at #793 in the United States.

What do Cassian and Rex mean?

Cassian means "of the Cassian family (Roman gens)" (Latin origin). Rex means "king" (Latin origin).

Are Cassian and Rex boy or girl names?

Cassian is primarily a boy name. Rex is primarily a boy name.