Group items tagged

In OS X you can set up a routine to batch-rename files using Apple's Automator program, where you can make a service plug-in that will offer you options to change names to collecitons of files.

When your workflow is complete, saving it will automatically place it in the /username/Library/Services/ folder, which will make it available via the OS X contextual menu. Now when you go to the Finder, you can select a group of files or folders, and then right-click them and select your workflow from the Services submenu of the contextual menu.