Olivia vs Sidnei

Baby Name Comparison — 2026

Olivia

Girl #1 Most Popular 4 Syllables

Meaning

"olive tree"

Origin: Latin

Cultural Roots

English Italian American

Quick Stats

Popularity Rank: #1
Total SSA Count: 14,718
Syllables: 4
Formality: Moderate
Nicknames: Liv, Livvy, Oli

Playground Safety Score

✓ All Clear

Similar Names

Rosalie Allison Alice Nora

Full profile for Olivia →

Sidnei

Girl #30,959 Most Popular

Quick Stats

Popularity Rank: #30,959
Total SSA Count: 6
Nicknames: Sid, Sidn, Sidny

Playground Safety Score

✓ All Clear

Similar Names

Alayha Mycha Braydin Cliona

Full profile for Sidnei →

Popularity Comparison

Olivia Rank #1

Sidnei Rank #30,959

Olivia is more popular, ranked #1 vs #30959 for Sidnei.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Olivia ___

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

Sidnei ___

No pairings available yet.

Sibling Name Ideas

Names that pair well as siblings.

If you choose Olivia

Liam Noah Charlotte Emma Sophia

If you choose Sidnei

No sibling data available yet.

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 Olivia or Sidnei more popular?

Olivia is more popular, ranked #1 compared to Sidnei at #30959 in the United States.

What do Olivia and Sidnei mean?

Olivia means "olive tree" (Latin origin).

Are Olivia and Sidnei boy or girl names?

Olivia is primarily a girl name. Sidnei is primarily a girl name.

More Comparisons

Sidnei vs Olivia Olivia vs Rosalie Olivia vs Allison Olivia vs Alice Olivia vs Nora

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