You are who you are. I can see no reason why you shouldn't take your Mother's name if that's what you want to do. There is nothing out of the ordinary in it and, as a matter of fact, it regularly happens all of the time. Author Anne McCaffery has two sons; the eldest bears his father's surname, the youngest Anne's maiden name in honour of her father.

Once you do change your name you will need a lawyer to sort out all sorts of legal stuff (credit ratings, passports, drivers licenses, mortgages, vehicle registration, etc.) as well as to notify, in writing, all of your friends that you have taken a new name. Post 9-11 the process isn't as simple as it once was. Expect the "change over" process to cost something in the neighborhood of $2,000 by the time every little detail is taken care of.

I would suggest that you talk it over with your lawyer before a final decision is made; you might also want to consider the option of adding your Mother's maiden name ahead of your family name either with, or without the hyphen, as this might simplify things.