Kaius vs Theodore

Baby Name Comparison — 2026

Kaius

Boy #1,137 Most Popular 3 Syllables

Meaning

"rejoice, be glad"

Origin: Latin

Cultural Roots

Latin Scandinavian Finnish

Quick Stats

Popularity Rank
#1,137
Total SSA Count
186
Syllables
3
Formality
Moderate
Nicknames
Kai

Playground Safety Score

✓ All Clear
Full profile for Kaius →

Popularity Comparison

Kaius Rank #1,137
Theodore Rank #4

Theodore is more popular, ranked #4 vs #1137 for Kaius.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Kaius ___

  • Kaius Alexander
  • Kaius James
  • Kaius Elliot
  • Kaius Arthur
  • Kaius Reid
  • Kaius Finn

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 Kaius

Callum Leona Aurora Finn Cassius

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 Kaius or Theodore more popular?

Theodore is more popular, ranked #4 compared to Kaius at #1137 in the United States.

What do Kaius and Theodore mean?

Kaius means "rejoice, be glad" (Latin origin). Theodore means "divine gift" (Greek origin).

Are Kaius and Theodore boy or girl names?

Kaius is primarily a boy name. Theodore is primarily a boy name.

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