Onyx vs Theodore

Baby Name Comparison — 2026

Onyx

Boy #359 Most Popular 2 Syllables

Meaning

"black gemstone"

Origin: Greek (onyx)

Cultural Roots

American

Quick Stats

Popularity Rank
#359
Total SSA Count
927
Syllables
2
Formality
Casual
Nicknames
Ox, Oni

Playground Safety Score

✓ All Clear
Full profile for Onyx →

Popularity Comparison

Onyx Rank #359
Theodore Rank #4

Theodore is more popular, ranked #4 vs #359 for Onyx.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Onyx ___

  • Onyx James
  • Onyx Cole
  • Onyx Reed
  • Onyx Sage
  • Onyx Atlas
  • Onyx Stone

Theodore ___

  • Theodore James
  • Theodore William
  • Theodore Alexander
  • Theodore John
  • Theodore Henry
  • Theodore Arthur

Sibling Name Ideas

Names that pair well as siblings.

If you choose Onyx

Jade Phoenix Flint Raven Zane

If you choose Theodore

Olivia Charlotte Amelia Eleanor Oliver

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 Onyx or Theodore more popular?

Theodore is more popular, ranked #4 compared to Onyx at #359 in the United States.

What do Onyx and Theodore mean?

Onyx means "black gemstone" (Greek (onyx) origin). Theodore means "divine gift" (Greek origin).

Are Onyx and Theodore boy or girl names?

Onyx is primarily a boy name. Theodore is primarily a boy name.

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← Full profile: Onyx ← Full profile: Theodore Browse all baby names