I believe this was a post apocalyptic book. Each man would have a name and a weapon. If they encountered someone else with the same name and weapon they would fight in a ring and the loser would have to change their name. Once of the characters was give a sword on the end of arm perhaps when they lost their hand? I think one guy fought with a rope which was unusual.
I read the book some time in the mid eighties
Thanks in advance for the help!