GRIMES has announces her nickname for her son X Æ A-12 after she and Elon Musk were forced to legally change his name.
The Canadian artist and the announced the birth of their first child earlier this month and caused a stir with his unusual name.
Grimes has now revealed she calls the baby "Little X" for short amid furious debates among fans about how to pronounce the name.
It comes after it emerged his name was changed from X Æ A-12 to X AE A-XII on his birth certificate - XII being the Roman numeral form of 12.
Little X's birth name was slightly changed to abide by California law, which does not allow certain characters in names.
The 32-year-old new mom shared the baby's nickname during an interview with promoting her upcoming art show in LA.
After changing the baby's name, Grimes also took to Instagram and said having it in Roman numerals "looks better tbh".
The couple's announcement of his name caused quite a stir, as many people didn't understand what it meant and couldn't work out how to pronounce it.
On Twitter, the Genesis singer said: "X, the unknown variable. Æ, my elven spelling of Ai (love &/or Artificial intelligence). A-12 = precursor to SR-17 (our favorite aircraft).
"No weapons, no defenses, just speed. Great in battle, but non-violent + (A=Archangel, my favorite song) (metal rat)."
To make matters more confusing, her and Elon appeared to disagree with how it was pronounced.
The tech entrepreneur explained it was "Ex Ash Archangel Twelve" while the artist claimed it was "Ex Ash A Twelve".
Little X's unusual name is claimed to be mostly the idea of Grimes, but his dad said the reference to the high speed recon plane was his idea.
Speaking on the Joe Rogan Podcast, Elon said: "I mean it’s just X, the letter X.
"Um, and then, the Æ is, like, pronounced ‘Ash’. And then, A-12, A-12 is my contribution.
"The Archangel-12, the precursor to the SR-71, the coolest plane ever."
Grimes and Musk welcomed the Little X into the world on May 4.
He is their first child together, but the 48-year-old Tesla boss also has six sons with his ex-wife Justine Wilson.
Tragically, one of his children, Nevada, who was born in 2002, died of sudden infant death syndrome at the age of just ten weeks.
Little X's arrival into the world comes as Grimes prepares to legally sell her soul to the highest bidder in a conceptual art piece titled Selling Out.
The original plan was to sell her soul for $10million, but she has since decided to sell it in an auction.
She said: "The deeper we got with it, the more philosophically interesting it became.
"The idea of fantastical art in the form of legal documents just seems very intriguing to me."
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Meanwhile, Musk will be attempting to make history tonight with the launch of SpaceX's Dragon spacecraft to carry two Nasa astronauts to the ISS.
It is the after the first launch on Wednesday was cancelled due to bad weather - and comes after a during an engine test in Texas
There have been no launches carrying humans into Earth orbit from US soil since the space shuttle was retired in 2011.
Musk - who has an estimated $38.2 billion fortune - dreams of revolutionizing space travel and creating a city on Mars by 2050.