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var
  Finished: Boolean;

procedure RenameFolder;
begin
  if Finished = true
    then RenameDir('c:\ordnername','C:\ordnername-neu');
end;					

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var
  Directory: String;  // Zu ändernder Ordnername
  OldDirList: TStringList;

procedure TForm1.FormCreate(Sender: TObject);
begin
  OldDirList := TStringList.Create;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  SearchRec: TSearchRec;
  Dir: String; // Zu überwachender Ordner
  NewDirList: TStringList;
  I: Integer;
  I2: Integer;
begin
  OldDirList.Add('a');
  OldDirList.Add('b');
  OldDirList.Add('d');
  OldDirList.Add('e');
  NewDirList := TStringList.Create;
  Dir := 'C:\testverzeichnis\';
  if FindFirst(dir+'*', faDirectory, SearchRec) = 0
    then
      begin
        repeat
          if (SearchRec.Name <> '.') and (SearchRec.Name <> '..')
            then NewDirList.Add(SearchRec.Name);
        until
          FindNext(SearchRec) <> 0;
        end;
  if NewDirList.Count < 1 then exit;
  if NewDirList.Count = 1
    then
      begin
        Directory := Dir+NewDirList.Strings[0];
        exit;
      end;
  for I := 0 to NewDirList.Count-1 do begin
    for I2 := 0 to OldDirList.Count-1 do begin
      if OldDirList.Strings[I2] = NewDirList.Strings[I]
        then
          break
        else
          if (I2 = OldDirList.Count-1) and (NewDirList.Strings[I] <> OldDirList.Strings[I2])
            then
              begin
                Directory := Dir+NewDirList.Strings[I];
                exit;
             end;
    end;
  end;
  NewDirList.Free;
  OldDirList.Free;
end;