Kai vs Lukas

Baby Name Comparison — 2026

Kai

Boy #76 Most Popular 1 Syllable

Meaning

"sea"

Origin: Hawaiian

Cultural Roots

Hawaiian Scandinavian Japanese American Chinese

Quick Stats

Popularity Rank
#76
Total SSA Count
4,276
Syllables
1
Formality
Casual

Playground Safety Score

✓ All Clear
Full profile for Kai →

Lukas

Boy #268 Most Popular 2 Syllables

Meaning

"light, illumination"

Origin: Greek and Latin

Cultural Roots

German Scandinavian Polish Czech Slovak Dutch

Quick Stats

Popularity Rank
#268
Total SSA Count
1,287
Syllables
2
Formality
Moderate
Nicknames
Luke, Lou

Playground Safety Score

✓ All Clear
Full profile for Lukas →

Popularity Comparison

Kai Rank #76
Lukas Rank #268

Kai is more popular, ranked #76 vs #268 for Lukas.

Popularity Over Time

Historical US popularity rank — lower number means more popular.

Middle Name Pairings

Kai ___

  • Kai James
  • Kai Alexander
  • Kai Michael
  • Kai Robert
  • Kai William
  • Kai Thomas

Lukas ___

  • Lukas James
  • Lukas Alexander
  • Lukas Henrik
  • Lukas Erik
  • Lukas Cole
  • Lukas Reid

Sibling Name Ideas

Names that pair well as siblings.

If you choose Kai

Zara Nova Mila Leo Finn

If you choose Lukas

Elias Mattias Sofia Annika Nils

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 Kai or Lukas more popular?

Kai is more popular, ranked #76 compared to Lukas at #268 in the United States.

What do Kai and Lukas mean?

Kai means "sea" (Hawaiian origin). Lukas means "light, illumination" (Greek and Latin origin).

Are Kai and Lukas boy or girl names?

Kai is primarily a boy name. Lukas is primarily a boy name.

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← Full profile: Kai ← Full profile: Lukas Browse all baby names