Kayo, pronounced "ka-yō", is of Japanese origin and means "happy" or "rejoice". It is often used as a unisex name but is more commonly given to girls in Japan. The name Kayo has gained some international recognition due to its use by notable figures such as Kayo Iba, a Japanese actress, and Kayo Shekhar, an Indian cricketer.
No significant popularity of the name Kayo in 1973, with only five recorded births that year.