Casimir vs Theodore

Baby Name Comparison — 2026

Casimir

Boy #2,401 Most Popular 3 Syllables

Meaning

"proclaimer of peace"

Origin: Old Polish Slavic

Cultural Roots

Polish Czech Lithuanian French Catholic

Quick Stats

Popularity Rank
#2,401
Total SSA Count
58
Syllables
3
Formality
Formal
Nicknames
Cas, Caz, Cassi

Playground Safety Score

✓ All Clear
Full profile for Casimir →

Theodore

Boy #4 Most Popular 3 Syllables

Meaning

"divine gift"

Origin: Greek

Cultural Roots

English French Greek

Quick Stats

Popularity Rank
#4
Total SSA Count
12,011
Syllables
3
Formality
Formal
Nicknames
Theo, Teddy, Ted

Playground Safety Score

✓ All Clear
Full profile for Theodore →

Popularity Comparison

Casimir Rank #2,401
Theodore Rank #4

Theodore is more popular, ranked #4 vs #2401 for Casimir.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Casimir ___

  • Casimir James
  • Casimir Anthony
  • Casimir John
  • Casimir Louis
  • Casimir Edmund
  • Casimir Felix

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 Casimir

Leopold Celestine Ambrose Isolde Ottoline

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 Casimir or Theodore more popular?

Theodore is more popular, ranked #4 compared to Casimir at #2401 in the United States.

What do Casimir and Theodore mean?

Casimir means "proclaimer of peace" (Old Polish Slavic origin). Theodore means "divine gift" (Greek origin).

Are Casimir and Theodore boy or girl names?

Casimir is primarily a boy name. Theodore is primarily a boy name.

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