Onyx vs Killian

Baby Name Comparison — 2026

Onyx

Boy #359 Most Popular 2 Syllables

"black gemstone"

Origin: Greek (onyx)

American

✓ All Clear

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

✓ All Clear

Onyx Rank #359

Killian Rank #370

Onyx is more popular, ranked #359 vs #370 for Killian.

Is Onyx or Killian more popular?

Onyx is more popular, ranked #359 compared to Killian at #370 in the United States.

What do Onyx and Killian mean?

Onyx means "black gemstone" (Greek (onyx) origin). Killian means "associated with the church" (Irish Gaelic origin).

Are Onyx and Killian boy or girl names?

Onyx is primarily a boy name. Killian is primarily a boy name.