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Last name Seidler (Seidler , Сайдлер , سيدلر ) , worldwide, is a common family name. The cognomen Seidler is characteristic of Germany, where it is quite a common surname, Austria, where it is quite a rare surname, and Czechia. Not in comparison with a country's population, it is commonest in Germany, the United States, and Brazil. Very seldom, Seidler is the forename as well as the last name.