Elon Musk said his and Grimes' new baby is named X Æ A-12. Grimes broke down the meaning behind each letter of the bizarre moniker. (TSLA)

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• Tesla and SpaceX CEO Elon Musk and the musician Grimes have had their first baby, a boy born Monday night.
• Musk has already caused confusion with the baby's name, which he tweeted is "X Æ A-12 Musk."
• Twitter users were trying to guess what the string of characters means. One person said it stands for "X Ash Archangel," which Musk liked on Twitter. Others guessed that the X related to the Bible book of Genesis or thought the name stood for "Jao."
• Grimes broke down the significance of each letter of the bizarre name on Twitter on Tuesday night, explaining that X stands for "the unknown variable," Æ stands for "my elven spelling of Ai" and A-12 is the "precursor to SR-17 (our favorite aircraft)." 
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The tech billionaire Elon Musk and the musician Grimes have welcomed their first child together, a boy born Monday night. Musk shared photos of the baby on Monday and confirmed that both Grimes and the baby were doing well.

But the Tesla and SpaceX CEO has already caused confusion over the baby's name, which he tweeted was "X Æ A-12 Musk."

See the rest of the story at Business Insider

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See Also:

• What you need to know about Grimes, the Canadian musician who just had a baby with tech billionaire Elon Musk
• Tech billionaire Elon Musk and musician Grimes have had their first child together. Here's where their relationship began and everything that's happened since.
• Tech billionaire Elon Musk and musician Grimes have had their first child together

SEE ALSO: Tech billionaire Elon Musk and musician Grimes have had their first child together. Here's where their relationship began and everything that's happened since.

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