Killian vs Sullivan

Baby Name Comparison — 2026

Killian

Boy #370 Most Popular 3 Syllables

"associated with the church"

Origin: Irish Gaelic

Irish French American English

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Boy #340 Most Popular 3 Syllables

"descendant of the dark one"

Origin: Irish Gaelic

Irish American English

✓ All Clear

Killian Rank #370

Sullivan Rank #340

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

Is Killian or Sullivan more popular?

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

What do Killian and Sullivan mean?

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

Are Killian and Sullivan boy or girl names?

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