Caius vs Billy

Baby Name Comparison — 2026

Caius

Boy #1,063 Most Popular 2 Syllables

"to rejoice, joyful"

Origin: Latin

Roman British European American

✓ All Clear

Boy #1,051 Most Popular 2 Syllables

"resolute protector"

Origin: Old German via Norman French

English American Australian Irish

✓ All Clear

Caius Rank #1,063

Billy Rank #1,051

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

Is Caius or Billy more popular?

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

What do Caius and Billy mean?

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

Are Caius and Billy boy or girl names?

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