Rex vs Cassian

Baby Name Comparison — 2026

Rex

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Boy #617 Most Popular 3 Syllables

"of the Cassian family (Roman gens)"

Origin: Latin

English American European

✓ All Clear

Rex Rank #793

Cassian Rank #617

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

Is Rex or Cassian more popular?

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

What do Rex and Cassian mean?

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

Are Rex and Cassian boy or girl names?

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