Tesla CEO Elon Musk and his singer-girlfriend Grimes have suggested different pronunciations of their baby's name 'X Æ A-12'. During a podcast, Musk said his newborn's name is pronounced as 'X Ash A twelve'. However, responding to a user on Instagram, Grimes said, "It's just X, like the letter X...Then A.I. Like how you said the letter A then I."