Callister vs Rio

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 #517 Most Popular 2 Syllables

"river"

Origin: Spanish/Portuguese

Spanish Portuguese Brazilian American

✓ All Clear

Callister Rank #43,579

Rio Rank #517

Rio is more popular, ranked #517 vs #43579 for Callister.

Is Callister or Rio more popular?

Rio is more popular, ranked #517 compared to Callister at #43579 in the United States.

What do Callister and Rio mean?

Callister means "defender of men" (Greek via Gaelic origin). Rio means "river" (Spanish/Portuguese origin).

Are Callister and Rio boy or girl names?

Callister is primarily a boy name. Rio is primarily a boy name.