Subject: Change user name ID having different name
This is far too late to be any help to you, but I ran into the same problem. The solution offered by IBM Support was to delete the Person record in question and then reregister the user with the correct name. At the end of the process, use the newly created ID file. There are two important precautions to take;1. Do NOT use “Delete User”, just delete the person record. Otherwise you lose all group associations, rights assignments, etc.
When reregistering, use some name for the mailfile other than the one actually in use, to avoid overwriting the current mailfile. (I used “bogus.nsf”.) Then, after the new ID is created, go to the new person record and edit the mailfile entry to point to the original mailfile.
This process is documented in IBM Doc Number 1224443.