Sullivan vs Knox

Baby Name Comparison — 2026

Sullivan

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Boy #209 Most Popular 1 Syllable

"round hill"

Origin: Old English/Scottish

American Scottish English

✓ All Clear

Sullivan Rank #340

Knox Rank #209

Knox is more popular, ranked #209 vs #340 for Sullivan.

Is Sullivan or Knox more popular?

Knox is more popular, ranked #209 compared to Sullivan at #340 in the United States.

What do Sullivan and Knox mean?

Sullivan means "descendant of the dark one" (Irish Gaelic origin). Knox means "round hill" (Old English/Scottish origin).

Are Sullivan and Knox boy or girl names?

Sullivan is primarily a boy name. Knox is primarily a boy name.