Oliver vs Rex

Baby Name Comparison — 2026

Oliver

Boy #3 Most Popular 3 Syllables

Meaning

"olive tree"

Origin: Latin

Cultural Roots

English French Scandinavian

Quick Stats

Popularity Rank
#3
Total SSA Count
15,343
Syllables
3
Formality
Moderate
Nicknames
Ollie, Oli

Playground Safety Score

✓ All Clear
Full profile for Oliver →

Popularity Comparison

Oliver Rank #3
Rex Rank #793

Oliver is more popular, ranked #3 vs #793 for Rex.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Oliver ___

  • Oliver James
  • Oliver Thomas
  • Oliver William
  • Oliver Henry
  • Oliver John
  • Oliver Benjamin

Rex ___

  • Rex James
  • Rex Oliver
  • Rex Arthur
  • Rex Henry
  • Rex William
  • Rex Theodore

Sibling Name Ideas

Names that pair well as siblings.

If you choose Oliver

Olivia Charlotte Emma Sophia Amelia

If you choose Rex

Max Leo Augustus Vivienne Cordelia

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 Oliver or Rex more popular?

Oliver is more popular, ranked #3 compared to Rex at #793 in the United States.

What do Oliver and Rex mean?

Oliver means "olive tree" (Latin origin). Rex means "king" (Latin origin).

Are Oliver and Rex boy or girl names?

Oliver is primarily a boy name. Rex is primarily a boy name.

More Comparisons

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← Full profile: Oliver ← Full profile: Rex Browse all baby names