Tesla billionaire, Elon Musk, and his partner, Grimes, have secretly welcomed a second child, Exa Dark Sideræl, or ‘Y’ for short, via surrogate.
Grimes, who is a musician, spoke out about their newest arrival in an interview, where she revealed that their daughter was born in December, while opening up about the origins of her unique name.
According to the singer, the newborn’s ‘quirky’ first name, Exa, was inspired by the supercomputing term exaFLOPS, which is “the ability to perform one quintillion floating-point operations per second”, while her second name, Dark, is a nod to dark matter and “the unknown”.
“People fear it, but truly it’s the absence of photons. Dark matter is the beautiful mystery of our universe”, Grimes said.
Finally, Sideræl, which is pronounced ‘sigh-deer-ee-el’, Grimes described as “the true time of the universe, star time, deep space-time, not our relative earth time”.
Their daughter’s third name is also a reference to Grimes’ favorite ‘Lord of the Rings’ character, the elf, Galadriel.
The couple calls the baby girl ‘Y’ for short, following the trend they started with the arrival of their first-born child, X Æ A-12, who Grimes gave birth to in May 2020, and whom she and Elon call, ‘X’. However, the couple was forced to change the spelling of their son’s name in order to comply with California law, which prohibits the use of any numbers or symbols in a name.

Following this, the couple revealed a few weeks after the first baby was born that his birth certificate would be registered under the name, X AE A-Xii, using the Roman numeral version of the number ’12’ and changing the character ‘æ’ to AE.
Elon and Grimes Might Alter New Child’s Name
According to reports, if Elon and Grimes choose to register their newborn daughter’s birth certificate in Texas, they will have to alter the spelling of her name, removing the symbol ‘æ’ once again to comply with state regulations, which only allow English characters to be used in a name.
Grimes in the interview agreed that their unique choice of names are not to everyone’s tastes, and admitted that she will not be surprised for her daughter to one day try change her name.
In the meantime, the baby girl has already been given a few alternatives, with the singer revealing that she and Elon also refer to their daughter as Sailor Mars, which was inspired by the cartoon, ‘Sailor Moon’.
The musician further disclosed that she had chosen her “dream” name for her daughter, Odysseus, before the couple settled on their chosen name.

Elon and Grimes in a Fluid Relationship
Grimes’ surprise baby announcement comes less than six months after the couple reportedly split up, having been dating for three years.
Speaking about the current status of their relationship, the singer described it as “fluid”. She explained that while she “would probably refer to [Elon] as her boyfriend”, the couple do not currently live together and each “have their own thing going on”.
“We live in separate houses. We’re best friends. We see each other all the time… We just have our own thing going on, and I don’t expect other people to understand it. This is the best it’s ever been… We just need to be free”.
Grimes
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