Kai vs Libby

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 →

Libby

Girl #1,122 Most Popular 2 Syllables

Meaning

"pledged to God, God is my oath"

Origin: Hebrew (via Elizabeth)

Cultural Roots

English American Irish

Quick Stats

Popularity Rank
#1,122
Total SSA Count
215
Syllables
2
Formality
Casual
Nicknames
Lib

Playground Safety Score

✓ All Clear
Full profile for Libby →

Popularity Comparison

Kai Rank #76
Libby Rank #1,122

Kai is more popular, ranked #76 vs #1122 for Libby.

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

Libby ___

  • Libby Jane
  • Libby Rose
  • Libby Mae
  • Libby Ann
  • Libby Grace
  • Libby Kate

Sibling Name Ideas

Names that pair well as siblings.

If you choose Kai

Zara Nova Mila Leo Finn

If you choose Libby

Nellie Archie Millie Freddie Rosie

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 Libby more popular?

Kai is more popular, ranked #76 compared to Libby at #1122 in the United States.

What do Kai and Libby mean?

Kai means "sea" (Hawaiian origin). Libby means "pledged to God, God is my oath" (Hebrew (via Elizabeth) origin).

Are Kai and Libby boy or girl names?

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

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