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Family name Marenco (Marenco , Маренко ) , in all the world, is a common last name. The family name Marenco is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a common surname, El Salvador, where it is quite a common surname, and Costa Rica. In absolute terms, it is commonest in Nicaragua, Italy, and El Salvador. Much less frequently, Marenco is the forename as well as the last name.