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Surname Casco (Casco , Kask , Kasko ) , in the entire world, is a common family name. The surname Casco is characteristic of Estonia, where it is a common surname, Paraguay, and Nicaragua, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Latin America and the Caribbean, particularly Argentina, Paraguay, and Honduras. Much less frequently, Casco is the forename as well as the last name.