Grimes revealed the name tweak via Instagram.
The Internet has been scratching it's head about how to pronounce X Æ A-12.
Grimes and Elon Musk announced the arrival of X Æ A-12 earlier this week.
But people are scratching their heads about how to pronounce it.
Tesla co-founder Elon Musk has shared photos of his first child with Canadian singer Grimes, and revealed the baby's unusual name. Billionaire entrepreneur Musk, 48, said the couple have named their newborn son X Æ A-12 Musk. X
The couple became proud parents to a baby boy on Monday.
Grimes recently opened up about the effect pregnancy had had on her skin.