Kai vs Sia

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 →

Sia

Girl #1,269 Most Popular 2 Syllables

Meaning

"victory (short for Sigrid)"

Origin: Norse

Cultural Roots

Scandinavian Australian International

Quick Stats

Popularity Rank
#1,269
Total SSA Count
183
Syllables
2
Formality
Casual

Playground Safety Score

✓ All Clear
Full profile for Sia →

Popularity Comparison

Kai Rank #76
Sia Rank #1,269

Kai is more popular, ranked #76 vs #1269 for Sia.

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

Sia ___

  • Sia Grace
  • Sia Rose
  • Sia Mae
  • Sia Luna
  • Sia Violet
  • Sia Claire

Sibling Name Ideas

Names that pair well as siblings.

If you choose Kai

Zara Nova Mila Leo Finn

If you choose Sia

Mia Gia Kai Noa Luca

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 Sia more popular?

Kai is more popular, ranked #76 compared to Sia at #1269 in the United States.

What do Kai and Sia mean?

Kai means "sea" (Hawaiian origin). Sia means "victory (short for Sigrid)" (Norse origin).

Are Kai and Sia boy or girl names?

Kai is primarily a boy name. Sia is primarily a girl name.

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