Cailo
Meaning
"rejoice, happy"
Origin: Welsh / Latin Gaius
Cultural Roots
Quick Stats
- Popularity Rank
- #15,816
- Total SSA Count
- 7
- Syllables
- 2
- Formality
- Casual
- Nicknames
- Kai, Cai, Kay
Baby Name Comparison — 2026
"rejoice, happy"
Origin: Welsh / Latin Gaius
"darling, dear beloved one"
Origin: American English
Darlene is more popular, ranked #1803 vs #15816 for Cailo.
Historical US popularity rank — lower number means more popular.
Historical trend data not available for this comparison.
Names that pair well as siblings.
Answer 3 quick questions and we'll help you decide.
1. Which style feels more like your family?
Darlene is more popular, ranked #1803 compared to Cailo at #15816 in the United States.
Cailo means "rejoice, happy" (Welsh / Latin Gaius origin). Darlene means "darling, dear beloved one" (American English origin).
Cailo is primarily a boy name. Darlene is primarily a girl name.