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Last name Эйлер (Euler , Eiler , Eyler ) , all over the world, is a common cognomen. The cognomen Эйлер is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Austria, and Luxembourg. Measured by absolute frequency, it is the most numerous in Germany, the United States, and Argentina. Likewise, Эйлер is the forename as well as the last name.