You can change font name or other properties like font version string or trademark. If you edit a font, make sure you are not violating the rights of its author. Refer to the License Agreement that comes with font.
Select OpenType or TrueType font in the Main view, right click on it and choose Edit Font Properties... menu command. Below you see the properties of the Aria.ttf font located in the FontExpert installation folder.
Edit desired properties, press Save as... button, and save the file under new file name.