Kai vs Jack

Baby Name Comparison — 2026

Kai

Boy #76 Most Popular 1 Syllable

"sea"

Origin: Hawaiian

Hawaiian Scandinavian Japanese American Chinese

✓ All Clear

Boy #15 Most Popular 1 Syllable

"supplanter"

Origin: Hebrew

English Irish American Australian

✓ All Clear

Kai Rank #76

Jack Rank #15

Jack is more popular, ranked #15 vs #76 for Kai.

Is Kai or Jack more popular?

Jack is more popular, ranked #15 compared to Kai at #76 in the United States.

What do Kai and Jack mean?

Kai means "sea" (Hawaiian origin). Jack means "supplanter" (Hebrew origin).

Are Kai and Jack boy or girl names?

Kai is primarily a boy name. Jack is primarily a boy name.