That sounds complicated. Names may have power in programming your energies - of course for us Zevists it's not a big issue as we counter-act against this.
Getting mad at even hearing your name is a sign you are obsessing with this, I think you are giving your name power on you and this is what drives you mad. It is possible unconscious mind accepts this christian name while you rationally refuse it, creating a conflict.
I see two solutions :
- You fight your battle and change your name. You will be happy at the end, because most of your energies will go against enemy programming and enemy seeds you may have in your chakras/subconscious. I think you are fighting against more than a name, maybe repressed hate for how you have been educated, or other issues. Victory here can be therapeutic BUT take in account the counter-actions by your parents who will try everything to keep you as you are now. If they are profoundly christian they will oppose your choice. Depending on your relationship with family, this can lead to freedom (if you have negative relationship with them) or loosing track if you are in a good family.
- You choose a new name and you use it everywhere, with friends, co-workers, etc. I had a co-worker who was never called by his name as he did not like it, he chose to be called with a name similar to "rock" (probably he wanted to resemble stronger and "hard"); he did even sign emails with that name and nobody used his true name anywhere. I do not even remember his true name, most people even did not know it. Except obviously in documents but who cares, you do not sign papers that often. This is the easy choice. You will be able to channel your energies in different stuff, like spiritual war / Ritual and spiritual evolution instead of a giant fight with your family.
I think choice depends on how much time, money and resources you have available, option 1 will require much more effort and - in case you legally loose against your family you may hate your name even more in future.