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Last name Floh (Floh ) , all over the world, is a rare surname. The family name Floh is characteristic of Western Europe, particularly Austria, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Austria, Germany, and Brazil. Much less frequently, Floh is the forename as well as the last name.