Kaisen vs Theodore

Baby Name Comparison — 2026

Kaisen

Boy #901 Most Popular 2 Syllables

Meaning

"continuous improvement"

Origin: Japanese

Cultural Roots

American Japanese Filipino

Quick Stats

Popularity Rank
#901
Total SSA Count
261
Syllables
2
Formality
Moderate
Nicknames
Kai

Playground Safety Score

✓ All Clear
Full profile for Kaisen →

Popularity Comparison

Kaisen Rank #901
Theodore Rank #4

Theodore is more popular, ranked #4 vs #901 for Kaisen.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Kaisen ___

  • Kaisen James
  • Kaisen Lee
  • Kaisen Cruz
  • Kaisen Finn
  • Kaisen Ryu
  • Kaisen Joel

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 Kaisen

Kai Zara Niko Lena Cora

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 Kaisen or Theodore more popular?

Theodore is more popular, ranked #4 compared to Kaisen at #901 in the United States.

What do Kaisen and Theodore mean?

Kaisen means "continuous improvement" (Japanese origin). Theodore means "divine gift" (Greek origin).

Are Kaisen and Theodore boy or girl names?

Kaisen is primarily a boy name. Theodore is primarily a boy name.

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