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Surname Plessis (Plessis , Плесси ) , all over the world, is a common family name. The surname Plessis is habitual in Namibia, where it is a common surname, Eswatini, where it is quite a common surname, and British Virgin Islands (explore the name in all countries). In absolute terms, the name is most common in South Africa, France, and Namibia. Very seldom, Plessis is the forename as well as the last name.