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In the entire world, Кайо (Caio , Kaio , Kajo ) is a widespread masculine forename. The first name Кайо is characteristic of Brazil, where it is quite a common masculine name, Portugal, where it is quite a rare male name, and Uruguay. In absolute terms, this name is the most popular in Brazil, India, and Nigeria. Much less frequently, Кайо is the last name as well as the forename.
Кайо 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).