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Last name Kallai (Kallai , Kállai , Каллаи ) , all around the world, is quite a common family name. The surname Kallai is characteristic of Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Qatar. In absolute terms, it is commonest in Hungary, Romania, and Ghana. Very seldom, Kallai is the forename as well as the last name.