Please accept Smeagol for Andy Serkis and Fangorn as an alternate for Treebeard as well as the wizards' real names... and please please please, Greenleaf is not Legolas' surname, it is the translation from its Sindarin form and the phrase is only ever mentioned once by Gandalf as an epithet not a full name!
removed Greenleaf
But what do you mean by the wizard's real names?