Cassius vs Onyx

Baby Name Comparison — 2026

Cassius

Boy #568 Most Popular 3 Syllables

"hollow, empty"

Origin: Latin

English American Roman

✓ All Clear

Boy #359 Most Popular 2 Syllables

"black gemstone"

Origin: Greek (onyx)

American

✓ All Clear

Cassius Rank #568

Onyx Rank #359

Onyx is more popular, ranked #359 vs #568 for Cassius.

Is Cassius or Onyx more popular?

Onyx is more popular, ranked #359 compared to Cassius at #568 in the United States.

What do Cassius and Onyx mean?

Cassius means "hollow, empty" (Latin origin). Onyx means "black gemstone" (Greek (onyx) origin).

Are Cassius and Onyx boy or girl names?

Cassius is primarily a boy name. Onyx is primarily a boy name.