Callister vs Billy

Baby Name Comparison — 2026

Callister

Boy #43,579 Most Popular 3 Syllables

"defender of men"

Origin: Greek via Gaelic

Scottish Manx Irish

✓ All Clear

Boy #1,051 Most Popular 2 Syllables

"resolute protector"

Origin: Old German via Norman French

English American Australian Irish

✓ All Clear

Callister Rank #43,579

Billy Rank #1,051

Billy is more popular, ranked #1051 vs #43579 for Callister.

Is Callister or Billy more popular?

Billy is more popular, ranked #1051 compared to Callister at #43579 in the United States.

What do Callister and Billy mean?

Callister means "defender of men" (Greek via Gaelic origin). Billy means "resolute protector" (Old German via Norman French origin).

Are Callister and Billy boy or girl names?

Callister is primarily a boy name. Billy is primarily a boy name.