Cassius vs Killian

Baby Name Comparison — 2026

Cassius

Boy #568 Most Popular 3 Syllables

"hollow, empty"

Origin: Latin

English American Roman

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Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

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Cassius Rank #568

Killian Rank #370

Killian is more popular, ranked #370 vs #568 for Cassius.

Is Cassius or Killian more popular?

Killian is more popular, ranked #370 compared to Cassius at #568 in the United States.

What do Cassius and Killian mean?

Cassius means "hollow, empty" (Latin origin). Killian means "associated with the church" (Irish Gaelic origin).

Are Cassius and Killian boy or girl names?

Cassius is primarily a boy name. Killian is primarily a boy name.