Rio vs Cassius

Baby Name Comparison — 2026

Rio

Boy #517 Most Popular 2 Syllables

"river"

Origin: Spanish/Portuguese

Spanish Portuguese Brazilian American

✓ All Clear

Boy #568 Most Popular 3 Syllables

"hollow, empty"

Origin: Latin

English American Roman

✓ All Clear

Rio Rank #517

Cassius Rank #568

Rio is more popular, ranked #517 vs #568 for Cassius.

Is Rio or Cassius more popular?

Rio is more popular, ranked #517 compared to Cassius at #568 in the United States.

What do Rio and Cassius mean?

Rio means "river" (Spanish/Portuguese origin). Cassius means "hollow, empty" (Latin origin).

Are Rio and Cassius boy or girl names?

Rio is primarily a boy name. Cassius is primarily a boy name.