Rei vs Caio

Baby Name Comparison — 2026

Rei

Boy #3,800 Most Popular 1 Syllable

"courtesy, respect, gratitude"

Origin: Japanese kanji 礼

Japanese American Brazilian

✓ All Clear

Boy #3,730 Most Popular 3 Syllables

"to rejoice, to be glad"

Origin: Latin

Brazilian Portuguese Italian Roman

✓ All Clear

Rei Rank #3,800

Caio Rank #3,730

Caio is more popular, ranked #3730 vs #3800 for Rei.

Is Rei or Caio more popular?

Caio is more popular, ranked #3730 compared to Rei at #3800 in the United States.

What do Rei and Caio mean?

Rei means "courtesy, respect, gratitude" (Japanese kanji 礼 origin). Caio means "to rejoice, to be glad" (Latin origin).

Are Rei and Caio boy or girl names?

Rei is primarily a boy name. Caio is primarily a boy name.