Short form of Clifford, now also sometimes of Clifton. It has been used occasionally as a given name, especially since the advent in the 1950s of the pop singer Cliff Richard (real name Harry Webb). It has sometimes also been associated with Clive.
German and Jewish (Ashkenazic): metonymic occupational name for a dealer in sugar or a confectioner, or a nickname for someone with a sweet tooth, from Middle High German zu(c)ker, German Zucker, Yiddish tsuker ‘sugar’. In some cases the Jewish surname is ornamental.