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Cognomen Koula (Koula , Кула , Κούλα ) , worldwide, is quite a common last name. The surname Koula is habitual in Bulgaria, where it is quite a common surname, Greece, and Gabon, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in the Democratic Republic of the Congo, Greece, and Bulgaria. Also, Koula is the forename as well as the last name.