You can easily rename a networked printer to give it a friendlier, more recognisable name. Navigate to the printers Ultimaker Connect page by inserting the printers IP in a web browser, or select manage on a cloud associated printer in your online printer dashboard.
From the printers web page, expand the menu by clicking the 3 dots. You will see the option to rename the printer.
Not sure which printer is which? Use the Identify printer option to make the selected printer flash its LED's, making it easy to identify from a group of printers.