Normally, the name of a reference database is defined when the it is created. However, it is also possible to change the name of a reference database later on:
If you would like to rename an existing reference database, please mark (click on) the corresponding line in the Reference Database Library dialog. Afterwards, press the "Rename" button at the bottom of the dialog, and enter the new name in the input window that is opened. Once you press "OK", the name of the currently marked reference database will be updated in the Reference Database Library.