Grimes had to change her and Elon Musk’s daughter’s name because government ‘wouldn’t recognise it’

Elon Musk’s ex-girlfriend Grimes has revealed their daughter's new name - but has said that the government wouldn’t 'recognise' it.

Grimes, whose real name is Claire Boucher, shares two children with the billionaire Twitter owner: a son called X Æ A-Xii and daughter Exa Dark Sideræl.

Their daughter was born via a ‘secret’ surrogate, with the birth only hitting headlines after a Vanity Fair journalist heard a baby crying during an interview at Grimes’s house in March last year.

Grimes initially remained cagey about the situation - when asked if there was another baby in the house, she told the journalist: “I’m not at liberty to speak on these things. Whatever is going on with family stuff, I just feel like kids need to stay out of it, and X is just out there.

“I mean, I think E is really seeing him as a protégé and bringing him to everything and stuff... X is out there. His situation is like that. But, yeah, I don’t know.”

But Grimes later confirmed that they had indeed welcomed a second baby.

Much like their son, the couple decided on a rather unusual moniker for their daughter - Exa Dark Sideræ.

Twitter

Grimes explained that the name means: "The true time of the universe, star time, deep space time, not our relative earth time." Fair enough.

While Grimes usually keeps the youngster out of the public eye, she recently posted a cute snap of her on Twitter, where she also shared the name change.

In the photo, the youngster can be seen sporting some yellow and green coloured hair, while wearing a red all-in-one, in a second photo, Grimes is showcasing similar coloured hair and a red onesie.

Captioning the shot, she wrote: “Y [dragon emoji] C”.

In a follow-up post, she confirmed that her daughter was no longer using the moniker Exa Dark Sideræl and is instead going by the much more simple to pronounce ‘Why’.

She wrote: “She's Y now, or "Why?" or just "?" (But the government won't recognize that). curiosity, the eternal question, .. and such.”

Many US states have restrictions against the use of ideograms, numbers and pictograms, like emojis.

Twitter

And this isn’t the first time the couple’s choice in names has caused an issue with US rules.

When he was first born, their son was named X Æ A-12, which is pronounced Ex Ash A Twelve.

But just a few weeks later, Grimes confirmed on her Instagram account that she and Musk had to get rid of the Arabic numbers ‘1’ and ‘2’.

While the A-12 had to go, the parents decided to use Roman numerals instead, so the baby's official name was changed to X Æ A-Xii.