That was so touching. I actually read it slowly (no skimming through any of it), taking it all in, feeling the words.
You know, I wanted so much for my mom to give me my female name, she wasn't able to, just couldn't think of anything and didn't think at this stage of my life that it was her right (I was giving birth to the new me, not her), but she was there for me when I had it changed to Megan.
It would be so sweet if your parents were to rename you, but that's currently just a daydream, have to see how they accept you first. However you choose to tell your mom, I hope that she will be there for you still, even if she does have a difficult time at first understanding it.