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All around the world, קאיו (Caio , קאיו ) is a widespread boy's first name. The first name קאיו is habitual in Brazil, where it is quite a common boy's name, Portugal, where it is quite a rare boy's name, and Uruguay. Measured by absolute frequency, it is commonest in Brazil, Italy, and Portugal. Very seldom, קאיו is the last name as well as the forename.
קאיו is also a name for the fictitious and mythical characters: Caius Camillus , character in Kaamelott; Caio Fabbricio , the operatic character in the opera Cajo Fabrizio (Hasse) and Caio Fabbricio , the operatic character in the opera Caio Fabbricio (Händel).