If they are all yours and always have been. And you are proactive and contact Blizzard first, they shouldn't have a problem with it. If they do, maybe you should reconsider giving them any more of your money. Not wanting to put your real name on the internet is understandable. You really should come up with a fake name that you can use consistently, however. Either way, give Blizzard a chance to let you change it. They certainly can't think you are trying to hide it from them if you bring it to them first.