Duncan vs Sullivan

Baby Name Comparison — 2026

Duncan

Boy #1,104 Most Popular 2 Syllables

"dark warrior"

Origin: Scottish Gaelic

Scottish Irish British American

✓ All Clear

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Duncan Rank #1,104

Sullivan Rank #340

Sullivan is more popular, ranked #340 vs #1104 for Duncan.

Is Duncan or Sullivan more popular?

Sullivan is more popular, ranked #340 compared to Duncan at #1104 in the United States.

What do Duncan and Sullivan mean?

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

Are Duncan and Sullivan boy or girl names?

Duncan is primarily a boy name. Sullivan is primarily a boy name.