Billy vs Caius

Baby Name Comparison — 2026

Billy

Boy #1,051 Most Popular 2 Syllables

"resolute protector"

Origin: Old German via Norman French

English American Australian Irish

✓ All Clear

Boy #1,063 Most Popular 2 Syllables

"to rejoice, joyful"

Origin: Latin

Roman British European American

✓ All Clear

Billy Rank #1,051

Caius Rank #1,063

Billy is more popular, ranked #1051 vs #1063 for Caius.

Is Billy or Caius more popular?

Billy is more popular, ranked #1051 compared to Caius at #1063 in the United States.

What do Billy and Caius mean?

Billy means "resolute protector" (Old German via Norman French origin). Caius means "to rejoice, joyful" (Latin origin).

Are Billy and Caius boy or girl names?

Billy is primarily a boy name. Caius is primarily a boy name.