Onyx vs Sullivan

Baby Name Comparison — 2026

Onyx

Boy #359 Most Popular 2 Syllables

"black gemstone"

Origin: Greek (onyx)

American

✓ All Clear

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Onyx Rank #359

Sullivan Rank #340

Sullivan is more popular, ranked #340 vs #359 for Onyx.

Is Onyx or Sullivan more popular?

Sullivan is more popular, ranked #340 compared to Onyx at #359 in the United States.

What do Onyx and Sullivan mean?

Onyx means "black gemstone" (Greek (onyx) origin). Sullivan means "descendant of the dark one" (Irish Gaelic origin).

Are Onyx and Sullivan boy or girl names?

Onyx is primarily a boy name. Sullivan is primarily a boy name.