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Worldwide, カリオ (Kario , カリオ , Kallio ) is quite a rare gender-neutral given name. The first name カリオ is habitual in the Democratic Republic of the Congo, where it is a rare male name, Indonesia, where it is a rare primarily boy's, but scarcely girly name, and India, where it is a very rare primarily female, but very seldom masculine name. More prevalently, カリオ is the last name as well as the forename.
カリオ is also a name for the fictitious and mythical characters: Kallio , the theatrical character in the play "Crossroads".