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Family name Willer (Willer , Виллер ) , in the world, is quite a common last name. The surname Willer is habitual in Denmark, where it is quite a rare surname, Germany, and Cameroon, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and France. Also, Willer is the forename as well as the last name.