Kai vs Leo

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 →

Leo

Boy #24 Most Popular 2 Syllables

Meaning

"lion-hearted, brave"

Origin: Latin

Cultural Roots

English Italian German French American Spanish

Quick Stats

Popularity Rank
#24
Total SSA Count
7,793
Syllables
2
Formality
Casual

Playground Safety Score

✓ All Clear
Full profile for Leo →

Popularity Comparison

Kai Rank #76
Leo Rank #24

Leo is more popular, ranked #24 vs #76 for Kai.

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

Leo ___

  • Leo James
  • Leo Thomas
  • Leo Alexander
  • Leo Cole
  • Leo Grey
  • Leo Xavier

Sibling Name Ideas

Names that pair well as siblings.

If you choose Kai

Zara Nova Mila Leo Finn

If you choose Leo

Luna Isla Mia Oscar Violet

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 Leo more popular?

Leo is more popular, ranked #24 compared to Kai at #76 in the United States.

What do Kai and Leo mean?

Kai means "sea" (Hawaiian origin). Leo means "lion-hearted, brave" (Latin origin).

Are Kai and Leo boy or girl names?

Kai is primarily a boy name. Leo is primarily a boy name.

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