Elon Musk and Grimes had to change their baby's name from X Æ A-12 to comply with California laws, The Independent reported.
Grimes took to her Instagram to confirm that the spelling of the baby's name has been changed.
Asked by fans whether they have changed the baby's name, Grimes responded: “X Æ A-Xii”.
“Roman numerals. Looks better tbh” and “One dash is allowed."
As the SpaceX founder Elon Musk said in an interview, Grimes was the one who had chosen the name.
"First of all, my partner is the one that, actually, mostly, came up with the name," he said.
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