Frank, kommen Sie bitte mal? Frank, could you come here, please? Calling someone by the first name and using Sie is known as the Hamburger Sie, the Hamburg Sie. Its mirror image is du with the surname. Gruber, mach mal bitte das Fenster zu! Gruber, close the window, please! This is known as the Münchner Du, the Munich du, or the Kassiererinnen-Du, the cashier’s du.