The child was born May 4. He was originally named X Æ A-12, but will now be known as X Æ A-Xii.
"Roman numerals. Looks better tbh," Grimes said when asked if she and her partner changed their baby's name due to a California law that wouldn't allow a numeral.
Grimes explained in an earlier post what the name means.
"X, the unknown variable. Æ, my elven spelling of Ai (love &/or Artificial intelligence) A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent. A=Archangel, my favorite song," she wrote.