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Last name Seiler (Seiler , Сейлер , 塞勒) , in the entire world, is a common surname. The cognomen Seiler is habitual in Western Europe, particularly Switzerland, where it is quite a common surname, Germany, and Austria, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Switzerland. Much less frequently, Seiler is the forename as well as the last name.