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Surname ולדר (Walder , ולדר ) , globally, is a common last name. The family name ולדר is habitual in Switzerland, where it is quite a common surname, Austria, and Paraguay, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Switzerland, Austria, and the United States. Very seldom, ולדר is the forename as well as the last name.