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Elon Musk and Grimes Welcome Second Baby Together, Daughter Exa Dark Sideræl

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The singer, 33, secretly welcomed another baby with Elon Musk, she revealed to Vanity Fair in a cover story for the magazine's April 2022 issue. 

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Grimes — who is also mom to 22-month-old son X Æ A-12, whom she also shares with the Tesla founder, 50 — told Vanity Fair that she and Musk welcomed a daughter in December 2021 via surrogate

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The baby's full name is Exa Dark Sideræl, though they've nicknamed her Y, according to Vanity Fair. 

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Grimes explained her daughter's unique name to the outlet, telling Vanity Fair that Exa refers to a supercomputing term, exaFLOPS, while Dark represents "the unknown." 

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She explained, "People fear it but truly it's the absence of photons. Dark matter is the beautiful mystery of our universe."

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Sideræl, the third part of Y's full name, is pronounced "sigh-deer-ee-el," according to Vanity Fair. Grimes called the word "a more elven" 

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spelling of sidereal, which she defined as "the true time of the universe, star time, deep space time, 

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not our relative earth time."
Sideræl has a double meaning, too, as a shoutout to Grimes' 

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favorite Lord of the Rings character, Galadriel, who "chooses to abdicate the ring."