Are you diagnosed? Ask your therapist pdoc whom ever told you, since you've researched that you want to know what your diagnosed off of. Behavior or whatever so that you all can assign a name. They are not suppose to withhold that information from you. Later on. you should get communication and naming will become easy because you can just ask inside....

Yes, I really believe if your remembering nicknames from the past that you either said about yourself or just over and over has something to do with it. Use those nicknames to start if you don't want to involve your therapist or pdoc for obvious reason you all have to both be comfortable and trust to openly discuss dissociative identity disorder in this way.