Elon Musk and Grimes have changed the official name of their baby from "X Æ A-12" to "X Æ A-Xii", the 32-year-old singer revealed. This comes after reports said that Californian laws prohibit Indo-Arabic numerals in names. Replying to comments on her Instagram post, Grimes further wrote, "Roman numerals. Looks better, to be honest. One dash is allowed."