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Family name Oehler (Элер , Oehler ) , throughout the world, is quite a common surname. The surname Oehler is characteristic of Switzerland, where it is quite a common surname, Eswatini, where it is quite a rare surname, and Germany. Not in comparison with a country's population, this name is the most popular in Germany, the United States, and Switzerland. Much less frequently, Oehler is the forename as well as the last name.