Kai vs Sunday

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 →

Popularity Comparison

Kai Rank #76
Sunday Rank #1,070

Kai is more popular, ranked #76 vs #1070 for Sunday.

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

Sunday ___

  • Sunday Rose
  • Sunday Mae
  • Sunday Rain
  • Sunday Blue
  • Sunday Grace
  • Sunday Joy

Sibling Name Ideas

Names that pair well as siblings.

If you choose Kai

Zara Nova Mila Leo Finn

If you choose Sunday

River Summer Sky Storm Ocean

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 Sunday more popular?

Kai is more popular, ranked #76 compared to Sunday at #1070 in the United States.

What do Kai and Sunday mean?

Kai means "sea" (Hawaiian origin). Sunday means "day of rest and worship" (Old English origin).

Are Kai and Sunday boy or girl names?

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

More Comparisons

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