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Surname Lenko (Lenko , Ленко , Ленько ) , throughout the world, is quite a rare last name. The cognomen Lenko is habitual in Lesotho, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Belarus. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Lenko is the forename as well as the last name.