Killian vs Olivia

Baby Name Comparison — 2026

Killian

Boy #370 Most Popular 3 Syllables

Meaning

"associated with the church"

Origin: Irish Gaelic

Cultural Roots

Irish French American English

Quick Stats

Popularity Rank
#370
Total SSA Count
884
Syllables
3
Formality
Moderate
Nicknames
Killy, Kill, Ian

Playground Safety Score

✓ All Clear
Full profile for Killian →

Popularity Comparison

Killian Rank #370
Olivia Rank #1

Olivia is more popular, ranked #1 vs #370 for Killian.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Killian ___

  • Killian James
  • Killian Patrick
  • Killian Thomas
  • Killian Finn
  • Killian Rory
  • Killian Sean

Olivia ___

  • Olivia Rose
  • Olivia Grace
  • Olivia Jane
  • Olivia Mae
  • Olivia Claire
  • Olivia Jade

Sibling Name Ideas

Names that pair well as siblings.

If you choose Killian

Cormac Riordan Aoife Declan Niamh

If you choose Olivia

Liam Noah Charlotte Emma Sophia

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 Killian or Olivia more popular?

Olivia is more popular, ranked #1 compared to Killian at #370 in the United States.

What do Killian and Olivia mean?

Killian means "associated with the church" (Irish Gaelic origin). Olivia means "olive tree" (Latin origin).

Are Killian and Olivia boy or girl names?

Killian is primarily a boy name. Olivia is primarily a girl name.

More Comparisons

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← Full profile: Killian ← Full profile: Olivia Browse all baby names