Neff Family History
Neff Name Meaning
German and Swiss German: from Middle High German neve ‘nephew’ (later rather broader in application, rather like cousin in English), hence probably a distinguishing name for a close relation or familiar of a prominent personage. Dutch: variant of Neve, cognate with 1. Jewish (Ashkenazic): from German Neffe ‘nephew’. Reduced form of Irish McNeff (see McNiff).
Source: Dictionary of American Family Names ©2013, Oxford University Press