This can be changed as follows:

  1. Tools > Edit Batch Setup
  2. Mark batch is recurring 
  3. Change Name / Description
  4. Unmark batch is recurring
  5. Save batch

Note:  This changes the name display only via the Batch screen.  All committed gifts, via File/Properties, still reflect the original batch number or name.  You may wish to add a note in the Description field that "When searching for gifts for this batch, search on [the original batch name]."