Bill vs Casyn

Baby Name Comparison — 2026

Bill

Boy #4,669 Most Popular 1 Syllable

"resolute protector"

Origin: Old High German Willahelm

English American Australian

✓ All Clear

Boy #4,583 Most Popular 2 Syllables

"vigilant, watchful"

Origin: Irish Gaelic

American Irish English

✓ All Clear

Bill Rank #4,669

Casyn Rank #4,583

Casyn is more popular, ranked #4583 vs #4669 for Bill.

Is Bill or Casyn more popular?

Casyn is more popular, ranked #4583 compared to Bill at #4669 in the United States.

What do Bill and Casyn mean?

Bill means "resolute protector" (Old High German Willahelm origin). Casyn means "vigilant, watchful" (Irish Gaelic origin).

Are Bill and Casyn boy or girl names?

Bill is primarily a boy name. Casyn is primarily a boy name.