Sullivan vs Casey

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 #310 Most Popular 2 Syllables

Irish English American

✓ All Clear

Sullivan Rank #340

Casey Rank #310

Casey is more popular, ranked #310 vs #340 for Sullivan.

Is Sullivan or Casey more popular?

Casey is more popular, ranked #310 compared to Sullivan at #340 in the United States.

What do Sullivan and Casey mean?

Sullivan means "descendant of the dark one" (Irish Gaelic origin).

Are Sullivan and Casey boy or girl names?

Sullivan is primarily a boy name. Casey is primarily a boy name.