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All over the world, Waclaw (Wacław , Waclaw , Вацлав ) is quite a common masculine forename. The first name Waclaw is characteristic of Poland, where it is quite a common male name, Lithuania, where it is quite a rare masculine name, and Ukraine. Not in comparison with a country's population, it is commonest in Eastern Europe, particularly Poland, Ukraine, and Russia. More prevalently, Waclaw is the last name as well as the forename.
Waclaw is also a name for the fictitious and mythical characters: Waclaw , the operatic character in the opera Der Bettelstudent; Wacław Wareda and Wacław Milczek , character in Zemsta.