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 35s ago
Set the Album Rating for the album of a selected track to full- and half-stars or computed clear-stars
downloaded 2m 55s ago
Assists with finding truncated iTunes Match tracks
downloaded 11m 38s ago
Perform search-and-replace on text in your choice of tags
downloaded 12m 6s ago
View/Edit tags of selected track(s) in single window
downloaded 12m 11s ago
Rename selected tracks' Song Names with their filenames (minus extension)
downloaded 12m 28s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags