Fergus vs Casyn

Baby Name Comparison — 2026

Fergus

Boy #4,453 Most Popular 2 Syllables

"man of vigor"

Origin: Old Irish

Scottish Irish English

✓ All Clear

Boy #4,583 Most Popular 2 Syllables

"vigilant, watchful"

Origin: Irish Gaelic

American Irish English

✓ All Clear

Fergus Rank #4,453

Casyn Rank #4,583

Fergus is more popular, ranked #4453 vs #4583 for Casyn.

Is Fergus or Casyn more popular?

Fergus is more popular, ranked #4453 compared to Casyn at #4583 in the United States.

What do Fergus and Casyn mean?

Fergus means "man of vigor" (Old Irish origin). Casyn means "vigilant, watchful" (Irish Gaelic origin).

Are Fergus and Casyn boy or girl names?

Fergus is primarily a boy name. Casyn is primarily a boy name.