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Family name Leiko (Leiko , Лейко , Леико ) , in the entire world, is quite a rare cognomen. The surname Leiko is characteristic of Belarus, where it is quite a rare surname, Ukraine, and Kazakhstan, where it is a rare surname. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Leiko is the forename as well as the last name.