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Across the world, Neff (Neff , ネフ , Нефф ) is a rare largely boy's, but infrequently feminine first name. The forename Neff is habitual in Switzerland, where it is a rare epicene name, Czechia, where it is a rare masculine name, and Italy, where it is a very rare male name. Measured by absolute frequency, it is the most numerous in the United States, Philippines, and Switzerland. Much more prevalently, Neff is the last name as well as the forename.