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Family name Boyko (Boyko , Бойко , Боико ) , worldwide, is a widespread cognomen. The family name Boyko is characteristic of Eastern Europe, particularly Ukraine, where it is a common surname, Belarus, where it is quite a common surname, and Russia (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Ukraine, Russia, and Kazakhstan. Much less frequently, Boyko is the forename as well as the last name.