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Family name Koehler (Koehler , 克勒 , 凯勒 ) , all over the world, is a common last name. The last name Koehler is habitual in Western Europe, particularly Germany, where it is quite a common surname, Austria, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Germany, the United States, and Brazil. Much less frequently, Koehler is the forename as well as the last name.