byname

from WordNet (r) 3.0 (2006)

byname
    n 1: a familiar name for a person (often a shortened version of
         a person's given name); "Joe's mother would not use his
         nickname and always called him Joseph"; "Henry's nickname
         was Slim" [syn: {nickname}, {moniker}, {cognomen},
         {sobriquet}, {soubriquet}, {byname}]

from The Collaborative International Dictionary of English v.0.48

By-name \By"-name`\, n.
   A nickname. --Camden.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Byname \By"name`\, v. t.
   To give a nickname to. --Camden.
   [1913 Webster]

[email protected]