Caspar vs Kaj

Baby Name Comparison — 2026

Caspar

Boy #6,197 Most Popular 2 Syllables

Meaning

"treasurer, keeper of treasure"

Origin: Persian

Cultural Roots

German Dutch Scandinavian English

Quick Stats

Popularity Rank
#6,197
Total SSA Count
15
Syllables
2
Formality
Moderate
Nicknames
Cas, Caz

Playground Safety Score

✓ All Clear
Full profile for Caspar →

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
Full profile for Kaj →

Popularity Comparison

Caspar Rank #6,197
Kaj Rank #6,083

Kaj is more popular, ranked #6083 vs #6197 for Caspar.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Caspar ___

  • Caspar James
  • Caspar William
  • Caspar Henry
  • Caspar Frederick
  • Caspar August

Kaj ___

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

Sibling Name Ideas

Names that pair well as siblings.

If you choose Caspar

Balthazar Felix Cecily Imogen Hugo

If you choose Kaj

Signe Astrid Leif Bjorn Sigrid

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 Caspar or Kaj more popular?

Kaj is more popular, ranked #6083 compared to Caspar at #6197 in the United States.

What do Caspar and Kaj mean?

Caspar means "treasurer, keeper of treasure" (Persian origin). Kaj means "to rejoice" (Latin (Caius/Gaius) origin).

Are Caspar and Kaj boy or girl names?

Caspar is primarily a boy name. Kaj is primarily a boy name.

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← Full profile: Caspar ← Full profile: Kaj Browse all baby names