Isn't she also Anna Marie Raven in X-Men Forever? I think the idea Claremont had is that Raven was Mystique's last name during her time as Eric Raven. There were some possible hints that Mystique was born male and could be considered trans. Eric Raven was her deadname and in her true form as a woman and blue, she would just use her surname as her new name. However, she also kept Raven as the family name for Rogue to take on.