As for the "BZ" name, Joanne said in an interview back in 2001 that it was the record company's idea not hers, so she decided to drop it from her stage name after she had already established herself as an artist.
As for the BZ name, Joanne said in an interview back in March 26th in 2001 that BZ were just letters that the record company three years ago chose to incorporate into her stage name. Joanne decided to drop it from her stage name after she had already established herself as an artist.