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Cognomen Kaia (Kaia , Кайа , Кайя ) , in all the world, is quite a rare last name. The last name Kaia is characteristic of Papua New Guinea, where it is quite a rare surname, Georgia, where it is a rare surname, and Greece. Not in comparison with a country's population, it is commonest in Russia, Papua New Guinea, and Indonesia. Likewise, Kaia is the forename as well as the last name.