You can change the name of the default Documents folder or folders that you create.
Folder names are not encrypted so choose a generic name that does not indicate the value of the folder contents.
To change the name of a folder, first scroll the menu and tap the Settings button.
Tap the Manage folders item in the Account section.
On the manage folders screen tap the name of the folder you want to rename.
Enter a new name for the folder in the Rename section and tap the Update button.
Afterwards the title and menu will be updated with the new name.