Rio vs Onyx

Baby Name Comparison — 2026

Rio

Boy #517 Most Popular 2 Syllables

"river"

Origin: Spanish/Portuguese

Spanish Portuguese Brazilian American

✓ All Clear

Boy #359 Most Popular 2 Syllables

"black gemstone"

Origin: Greek (onyx)

American

✓ All Clear

Rio Rank #517

Onyx Rank #359

Onyx is more popular, ranked #359 vs #517 for Rio.

Is Rio or Onyx more popular?

Onyx is more popular, ranked #359 compared to Rio at #517 in the United States.

What do Rio and Onyx mean?

Rio means "river" (Spanish/Portuguese origin). Onyx means "black gemstone" (Greek (onyx) origin).

Are Rio and Onyx boy or girl names?

Rio is primarily a boy name. Onyx is primarily a boy name.