Grimes Reveals That She And Elon Musk Have A Second Child Together

The couple's baby girl is named Exa Dark Sideræl, but her parents call her Y.
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Grimes, left, and Elon Musk.
Grimes, left, and Elon Musk.
via Associated Press

Although the status of Elon Musk and Grimes’ relationship has been unclear since the tech billionaire said they were “semi-separated” in September, they are apparently close enough to have a second child together.

The 33-year-old singer revealed to Vanity Fair that she and Musk had a baby girl in December 2021 via a surrogate.

The baby’s full name is Exa Dark Sideræl, but her parents call her simply Y. The couple’s first child, a boy, is named X AE A-Xii, and goes by X.

Grimes said their new baby’s name references the supercomputing term exaFLOPS, while “Dark” represents “the unknown,” adding, “Dark matter is the beautiful mystery of our universe.”

Meanwhile, Sideræl — which is pronounced “sigh-deer-ee-el” — refers to “the true time of the universe, star time, deep space time, not our relative earth time.” It’s also a nod to Galadriel, a character from ”Lord of the Rings.”

But, Grimes noted, Exa wasn’t her first choice. She told Vanity Fair that she lobbied to name her daughter Odysseus Musk because “a girl named Odysseus is my dream.”

Musk appeared to announce their separation last fall, but Grimes told Vanity Fair that she and Musk were indeed together, though they don’t use typical labels.

“There’s no real word for it,” she said. “I would probably refer to him as my boyfriend, but we’re very fluid. 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.”

Grimes also said she and Musk have talked about having three or four kids.

Those plans may be on hold for now. Later Thursday, after the Vanity Fair article was published, Grimes tweeted that she and “E have broken up *again* since the writing of this article haha, but he’s my best friend and the love of my life.”

This article has been updated to include Grimes’ tweet about her relationship status.

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