Musk revealed his son's name was X Æ A-12 and many wondered if that would be the real name, there's been a change due to the Californian law, although not a major one. Elon Musk and Grimes have changed their son's name to X Æ A-Xii to abide by the California law. The change of numerals to roman letters has once again been the target of funny memes and jokes on Twitter.