You can change the names of master pages.
Procedure
-
In the Master Pages section of the Pages panel, select the master page set containing the master page you want to rename from the Current set menu.
-
In the Master Pages section, click the master page pair that you want to rename.
-
Click Rename Master Page.
The Rename Master Page dialog opens.
-
Enter the name you want in the Name field.
-
Click OK to save your changes and close the dialog.