My character has two copies with the same name. The one I played is level 32 now. The other one is level 1. Concerned that if I delete one a bug could possibly delete the one I’ve invested in by mistake, though that seems like a low possibility, I worry that if it can create two copies it could also delete two.
I deliberately created 2 characters with the same name to judge which look I liked better. I deleted one and the one I wanted remained. They were only level 1 though so I had nothing to lose.
You could just experiment and make 2 disposable characters to test it out. I don’t know if it is a bug to have your characters named the same. Hope that this helps.