Cillian vs Olivia

Baby Name Comparison — 2026

Popularity Comparison

Cillian Rank #464
Olivia Rank #1

Olivia is more popular, ranked #1 vs #464 for Cillian.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Cillian ___

  • Cillian James
  • Cillian Patrick
  • Cillian Michael
  • Cillian Finn
  • Cillian Declan
  • Cillian Joseph

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 Cillian

Declan Finn Conor Siobhan Saoirse

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 Cillian or Olivia more popular?

Olivia is more popular, ranked #1 compared to Cillian at #464 in the United States.

What do Cillian and Olivia mean?

Cillian means "strife, war" (Old Irish origin). Olivia means "olive tree" (Latin origin).

Are Cillian and Olivia boy or girl names?

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

More Comparisons

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