Kaj vs Theodore

Baby Name Comparison — 2026

Kaj

Boy #6,083 Most Popular 1 Syllable

Meaning

"to rejoice"

Origin: Latin (Caius/Gaius)

Cultural Roots

Danish Swedish Norwegian German

Quick Stats

Popularity Rank
#6,083
Total SSA Count
15
Syllables
1
Formality
Moderate

Playground Safety Score

All Clear

Popularity Comparison

Kaj Rank #6,083
Theodore Rank #4

Theodore is more popular, ranked #4 vs #6083 for Kaj.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Kaj ___

  • Kaj Erik
  • Kaj Lars
  • Kaj Wilhelm
  • Kaj Gustav
  • Kaj Magnus
  • Kaj Nils

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 Kaj

Signe Astrid Leif Bjorn Sigrid

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 Kaj or Theodore more popular?

Theodore is more popular, ranked #4 compared to Kaj at #6083 in the United States.

What do Kaj and Theodore mean?

Kaj means "to rejoice" (Latin (Caius/Gaius) origin). Theodore means "divine gift" (Greek origin).

Are Kaj and Theodore boy or girl names?

Kaj is primarily a boy name. Theodore is primarily a boy name.

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