Cognomen ネフ (Nef 
, Neff , ネフ 
) , worldwide, is a common surname. The family name ネフ is characteristic of Switzerland, where it is quite a common surname, Bermuda, and the United States, where it is quite a rare surname. Measured by absolute frequency, it is commonest in the United States, Germany, and Switzerland. Very seldom, ネフ is the forename as well as the last name.