Save Gender Masculine Usage Obscure Pronounced Pron. [eks.aɪ.ˈeɪ.twɛlv], [eks.æʃ.ˈeɪ.twɛlv] [key·simplify] Other Forms FormsX Æ A-12 Meaning & History This name was devised by Elon Musk and Claire Grimes for their son, born in 2020. The name was originally X Æ A-12, but was changed to X Æ A-Xii because California law does not allow the use of numbers in names.