Elon Musk and singer Grimes have confirmed they have named their baby X Æ A-12, the BBC reports.
The Space X CEO announced the birth of their son on Monday. “Mom & baby all good,” he said on Twitter.
He posted that the child would be called X Æ A-12 Musk and his girlfriend later offered an explanation to her followers on social media.
When Musk, known to joke on Twitter, announced the name, many people questioned whether he was being serious.
However, Canadian singer Grimes, real name Claire Boucher, explained the name’s meaning to her fans.
Æ, a ligature of a and e known as ash, appeared in Latin and Old English but has mostly fallen out of use. However, in some languages such as Danish, Norwegian and Icelandic, Æ is classed as a letter.
The singer has used Æ before, naming a song on her latest album 4ÆM.
The A-12 is a Lockheed plane built for the CIA. It was known by designers during its development as Archangel.
She also claims Archangel is her favourite song but does not explain who the song is by.
It remains unclear how the name is pronounced. However, when someone on Twitter asked Musk whether it could be X Ash Archangel, Musk liked the comment, giving the biggest clue as to how it might sound.
