Hephzibah is not "nickname free". In
George Eliot's novel
Silas Marner, the character named
Hephzibah is called
Eppie. And there would be plenty of other short forms one could get out of
Hephzibah with a little effort. (Heppie, Zibbie, Ezzie, etc.)
http://www.schoolbytes.com/summary.php?id=435