i just wanna say that, there is a difference between using a wrong name for Buffy and a false name for Spike. Of course Spike has a last name, but it happens that nobody knows it. Therefore in AU, it is necessary to makeup a surname, which is why many people make him the son of either ethan or Giles, as they are all english it makes it more plausible. Whereas to change Buffy's name in a sense changes the character. Lots of people use Elizabeth and that's fine, it's the writers perrogative, but it is understandble why some people are annoyed by it. But when you talk about technicalities with Spike's name, take into account that it is neccessaery to give him a last name. It is not neccessary to change Buffy';s name. Don't get me wrong, this is not meant to insult you or to be a flame, i just wanted to point out where some other people might be coming from. But it is your choice how you want to do your story. I respect that. I just wanted to explain how some people might think.