Leo vs Callister

Baby Name Comparison — 2026

Leo

Boy #24 Most Popular 2 Syllables

"lion-hearted, brave"

Origin: Latin

English Italian German French American Spanish

✓ All Clear

Boy #43,579 Most Popular 3 Syllables

"defender of men"

Origin: Greek via Gaelic

Scottish Manx Irish

✓ All Clear

Leo Rank #24

Callister Rank #43,579

Leo is more popular, ranked #24 vs #43579 for Callister.

Is Leo or Callister more popular?

Leo is more popular, ranked #24 compared to Callister at #43579 in the United States.

What do Leo and Callister mean?

Leo means "lion-hearted, brave" (Latin origin). Callister means "defender of men" (Greek via Gaelic origin).

Are Leo and Callister boy or girl names?

Leo is primarily a boy name. Callister is primarily a boy name.