Siobhan vs Sullivan

Baby Name Comparison — 2026

Sullivan

Boy #340 Most Popular 3 Syllables

Meaning

"descendant of the dark one"

Origin: Irish Gaelic

Cultural Roots

Irish American English

Quick Stats

Popularity Rank
#340
Total SSA Count
1,011
Syllables
3
Formality
Moderate
Nicknames
Sully, Van

Playground Safety Score

✓ All Clear
Full profile for Sullivan →

Popularity Comparison

Siobhan Rank #1,931
Sullivan Rank #340

Sullivan is more popular, ranked #340 vs #1931 for Siobhan.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Siobhan ___

  • Siobhan Rose
  • Siobhan Mary
  • Siobhan Grace
  • Siobhan Fiona
  • Siobhan Claire
  • Siobhan Brigid

Sullivan ___

  • Sullivan James
  • Sullivan Patrick
  • Sullivan Thomas
  • Sullivan Reid
  • Sullivan Finn
  • Sullivan Grant

Sibling Name Ideas

Names that pair well as siblings.

If you choose Siobhan

Aoife Niamh Cormac Declan Saoirse

If you choose Sullivan

Finnegan Declan Bridget Nora Callum

Which Name Fits Your Family?

Answer 3 quick questions and we'll help you decide.

1. Which style feels more like your family?

Frequently Asked Questions

Is Siobhan or Sullivan more popular?

Sullivan is more popular, ranked #340 compared to Siobhan at #1931 in the United States.

What do Siobhan and Sullivan mean?

Siobhan means "God is gracious" (Hebrew origin). Sullivan means "descendant of the dark one" (Irish Gaelic origin).

Are Siobhan and Sullivan boy or girl names?

Siobhan is primarily a girl name. Sullivan is primarily a boy name.

More Comparisons

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← Full profile: Siobhan ← Full profile: Sullivan Browse all baby names