Sullivan vs Killian

Baby Name Comparison — 2026

Sullivan

Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

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Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

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Sullivan Rank #340

Killian Rank #370

Sullivan is more popular, ranked #340 vs #370 for Killian.

Is Sullivan or Killian more popular?

Sullivan is more popular, ranked #340 compared to Killian at #370 in the United States.

What do Sullivan and Killian mean?

Sullivan means "descendant of the dark one" (Irish Gaelic origin). Killian means "associated with the church" (Irish Gaelic origin).

Are Sullivan and Killian boy or girl names?

Sullivan is primarily a boy name. Killian is primarily a boy name.