According to the books, she doesn't remember her last name.
Cynthia
her name is Cynthia :)
Mary Alice Brandon
Mary then her middle name was Alice
Cynthia
Cynthia Brandon
Alice Nelson
Alice had a little sister named Cynthia. Alices sister's name is Cynthia Brandon. In New moon Cynthia's daughter (alice's neice) is still alive.
Hale. and why? it is because if alices and jaspers last name was the same that would be weird because they are dating. and because he looks like rosalie and rosalie wanted to keep her last name hale because it was what she had when she was human. they are supposed to be twins.
Alice Cullen or Mary Alice Brandon was her human name.
Mary Alice Brandon (Answer from www.twilightlexicon.com).
Cynthia Brandon It never disclosed her middle name.