Elon Musk, Grimes change baby name because of California rules

California prohibits numbers in names

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Tesla CEO Elon Musk and musician Grimes are tweaking their son's name, which apparently flouted California rules prohibiting numbers in names.

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Grimes revealed the update — changing the name from "X Æ A-12" to "X Æ A-Xii" — on her Instagram on Sunday.

Instagram screenshot

"Roman numerals. Looks better [to be honest]," Grimes wrote in the comment section of her most recent Instagram post. "[O]ne dash is allowed."

Grimes explained the baby's unique name earlier in May. X represents "the unknown variable," Æ the "elven spelling of Ai (love [and]/or Artificial intelligence)" and A-12 the precursor to her and Musk's favorite aircraft the SR-71.

"No weapons, no defenses, just speed. Great in battle, but non-violent," Grimes wrote on Twitter, adding that A also stood for "Archangel," her favorite song.

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Musk and Grimes welcomed the baby, her first child, on May 4.

Musk has five sons from his previous marriage to author Justine Wilson.

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