Jack vs Kai

Baby Name Comparison — 2026

Jack

Boy #15 Most Popular 1 Syllable

"supplanter"

Origin: Hebrew

English Irish American Australian

✓ All Clear

Boy #76 Most Popular 1 Syllable

"sea"

Origin: Hawaiian

Hawaiian Scandinavian Japanese American Chinese

✓ All Clear

Jack Rank #15

Kai Rank #76

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

Is Jack or Kai more popular?

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

What do Jack and Kai mean?

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

Are Jack and Kai boy or girl names?

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