Grimes and Elon Musk have revealed they altered their son's quirky name to comply with Californian law.
In a moment that left absolutely everyone flummoxed, the singer, 32, and the tech guru, 48, originally named their baby boy X Æ A-12.
But, as predicted, legal restrictions have meant they've now had to altered the moniker (although - we warn you - it's not much simpler to get your head around...)
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Grimes revealed the change on Instagram when one fan asked how she'd got around the rules in California, which only allow you to use the '26 characters' of the English language in your baby name.
"Did you change the baby name because of Californian laws ? What is the baby's new name?," the fan asked.
To which Grimes responded: "X Æ A-Xii".
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(And there was half us expecting the birth certificate to have a bog standard name on it, like Joe!)
"Nice! Just removed the numbers to confirm to California law," the fan then replied, before Grimes wrote back, confirming: "Roman numerals. Looks better tbh...one dash is allowed".
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Grimes - real name Claire Elise Boucher - and SpaceX CEO Elon announced the arrival of their newborn at the start of May, revealing the unusual title shortly afterwards.
The Oblivion singer went on to explain the meaning behind the moniker in more detail.
"X, the unknown variable," Grimes wrote at the time, "Æ, my elven spelling of Ai (love &/or Artificial intelligence).
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"A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent."
Anyone any clearer? Nope, us either.
She also explained that the "A" in the name also stands for her "favourite song", "Archangel,", while the 12 stands for the Chinese zodiac sign of the rat, which we are currently in.
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Oddly, both parents seem to have different ideas on how to pronounce the name, too.
When one fan questioned how to say X Æ A-12 on Instagram, the Canadian singer replied: "It's just X, like the letter X.
"Then A.I. Like how you said the letter A then I".
Meanwhile, speaking on Joe Rogan's podcast, the Tesla inventor agreed that the X was spoken "like the letter," but added that 'the 'Æ' is pronounced like ash'".
Looks like these two need to make a decision, sharpish!
Featured Image Credit: PATopics: Celebrity News