Koji vs Theodore

Baby Name Comparison — 2026

Koji

Boy #4,251 Most Popular 2 Syllables

Meaning

"luminous second son"

Origin: Japanese ko (light) and ji (second son)

Cultural Roots

Japanese

Quick Stats

Popularity Rank
#4,251
Total SSA Count
25
Syllables
2
Formality
Moderate
Nicknames
Ko

Playground Safety Score

✓ All Clear
Full profile for Koji →

Popularity Comparison

Koji Rank #4,251
Theodore Rank #4

Theodore is more popular, ranked #4 vs #4251 for Koji.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Koji ___

  • Koji James
  • Koji Alexander
  • Koji Lee
  • Koji Ren
  • Koji Kai
  • Koji Rio

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 Koji

Hana Yuki Kenji Riku Saki

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 Koji or Theodore more popular?

Theodore is more popular, ranked #4 compared to Koji at #4251 in the United States.

What do Koji and Theodore mean?

Koji means "luminous second son" (Japanese ko (light) and ji (second son) origin). Theodore means "divine gift" (Greek origin).

Are Koji and Theodore boy or girl names?

Koji is primarily a boy name. Theodore is primarily a boy name.

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