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Surname Waclaw (Wacław , Waclaw , Вацлав ) , all over the world, is a widespread cognomen. The last name Waclaw is characteristic of Poland, where it is a common surname, Slovenia, where it is a rare surname, and Sweden. Measured by absolute frequency, it is commonest in Poland, the United States, and Germany. Very seldom, Waclaw is the forename as well as the last name.