OS X 10.9 or later. iTunes only allows one playlist to be selected at a time. This applet can perform common useful tasks on a multiple selection of playlists: rename (add text, remove text, search and replace text), duplicate, delete, export, merge.
Tools in the Rename tab operate on the selected playlists' names
(via in-app purchase)
Perhaps Also of Interest...
downloaded 4m 32s ago
Display, create text file listing info of dead tracks
downloaded 30m 37s ago
Copy Artist to Album Artist of selected tracks
downloaded 35m 5s ago
Set the Plays of selected tracks.
downloaded 38m 25s ago
Convert selected tracks and export the converted files to a new folder
downloaded 39m 3s ago
Sort purchased tracks into discrete playlists by name or Apple ID
downloaded 39m 25s ago
Search for lyric sites with Google using info from the current or selected track