you cant stop players from using same name as you do. It is free and users are free of use. Ofc lots of players dont do this due to mutual respect to other players. What you mean is that you want all players that use your name will be banned on all servers, but that is just unrealistic since u need to contact every server admin individual and eventually you wont get the wanted result. This is my reply towards what I understand in this problem you are mentioning.
Just keep your rate locked so it wont get stolen/fucked, and if you can, go to same server as that dude and ask him to change name. no other options imo.