Jack vs Declan

Baby Name Comparison — 2026

Jack

Boy #15 Most Popular 1 Syllable

"supplanter"

Origin: Hebrew

English Irish American Australian

✓ All Clear

Boy #131 Most Popular 2 Syllables

"man of prayer"

Origin: Irish Gaelic

Irish English American

✓ All Clear

Jack Rank #15

Declan Rank #131

Jack is more popular, ranked #15 vs #131 for Declan.

Is Jack or Declan more popular?

Jack is more popular, ranked #15 compared to Declan at #131 in the United States.

What do Jack and Declan mean?

Jack means "supplanter" (Hebrew origin). Declan means "man of prayer" (Irish Gaelic origin).

Are Jack and Declan boy or girl names?

Jack is primarily a boy name. Declan is primarily a boy name.