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Cognomen Loer (Loer ) , all around the world, is quite a rare last name. The last name Loer is characteristic of Western Europe, particularly Netherlands, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland. Measured by absolute frequency, it is the most numerous in Germany, Netherlands, and the United States. Much less frequently, Loer is the forename as well as the last name.