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Last name Zaiko (Zaiko , Зайко , Заико ) , across the world, is quite a common family name. The last name Zaiko is characteristic of Belarus, where it is quite a common surname, Lithuania, where it is quite a rare surname, and Ukraine. In absolute terms, it is commonest in Eastern Europe, particularly Russia, Belarus, and Ukraine. Very seldom, Zaiko is the forename as well as the last name.