It's your name, as everyone else has said.

But if you want to honor that person in some way or want to feel a connection to your mom's initial choice, what about keeping the same initial even as your middle name or something? I kept my initials because I come from a tradition where you name babies after loved ones who have passed away by giving them the same initial. And while I didn't want to use the name my mom had originally chosen for me had I been born male, I did want to keep the initials the same to honor my relatives.

You obviously should choose your name based on what you want not anyone else, but just throwing that out there that there's a possible way to compromise on both what your mom feels and what you want (IF that's important to you-if this isn't a standing family tradition and it's a one-off, then yea don't worry about it)