I'm sorry for the awfully slow response to this thread.
Unfortunately, there doesn't appear to be any way to resolve this issue for your league. Because the program stores your name data when the game is first created, it's going to continue generating nobodys, even though a newly-created game would not have this issue.
I think perhaps the only way to continue this league is to use the roster export/import process to rename the players. Pretty cumbersome.
Sorry I didn't have better information for you.
Thanks,
Steve