Isobel Thomas goes by Issy.
Lee Go goes by Willy.
Midge :)
Emmett Till was not known to go by any specific nicknames.
David Gohman goes by Go-Go.
My Do goes by Phimy, and MyMy.
Will Englander goes by Will.
Will Blomquist goes by Will.
Will Blagrove goes by Will.
Will Young goes by Will.
Chuck Seifert does not appear to go by any commonly known nicknames.
Frank Hamer, the Texas Ranger, is known to go by the nicknames "Pancho" or "Frank the Investigator".