Killian vs Cassius

Baby Name Comparison — 2026

Killian

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

✓ All Clear

Boy #568 Most Popular 3 Syllables

"hollow, empty"

Origin: Latin

English American Roman

✓ All Clear

Killian Rank #370

Cassius Rank #568

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

Is Killian or Cassius more popular?

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

What do Killian and Cassius mean?

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

Are Killian and Cassius boy or girl names?

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