Elon Musk and singer Grimes named their first child together "X Æ A-12" at birth in May 2020. Due to California law restrictions on names, they later changed it to "X Æ A-Xii" using Roman numerals instead of numbers. The name is pronounced approximately as "X Ash A Twelve," with "X" representing the unknown variable, "Æ" (pronounced "Ash") being an Elven spelling of AI (artificial intelligence and love), and "A-12" referring to the Archangel 12, a precursor to the SR-71 aircraft, which they admire for its speed and non- violent nature
. They often call him simply "X" for short. Elon Musk and Grimes also have other children with unique names, including a daughter named Exa Dark Sideræl and a son named Techno Mechanicus (nicknamed "Tau")
