Elon Musk and Grimes’ daughter is now named Y. Here’s why

Elon Musk and Grimes just revealed their latest head-scratching baby name.

The off-again, on-again duo is now calling their daughter Y, having given a new moniker to the 15-month-old they had originally named Exa Dark Sideræl.

Grimes revealed the new name on Twitter, as she posted photos of herself and her daughter with matching red jumpsuits and green-tinged hair. “Y (dragon emoji) C,” Grimes wrote in the caption. (Grimes’ real name is Claire Elise Boucher.)

And when a fan account raved over the photos, Grimes elaborated.

“She’s Y now, or ‘Why?’ or just ‘?’ (But the government won’t recognize that),” Grimes tweeted. “Curiosity, the eternal question… and such.”

Musk, 35, and Grimes, 51, also have a son named X Æ A-12, pronounced “X Ash A Twelve.”

But because California requires names to be limited to the letters of the English alphabet, the 2-year-old is listed with the first name X, the middle name AE A-XII, and the last name Musk on his birth certificate, according to TMZ.

A Vanity Fair cover story on Grimes posted online a year ago mentioned Y as a nickname for her and Musk’s daughter.

Grimes also elaborated on the meaning of Exa Dark Sideræl at the time. Exa is a reference to exaFLOPS, a supercomputing term for the capability to perform a quintillion floating-point operations per second, Grimes told Vanity Fair. Dark is a reference to “the unknown” and to the “beautiful mystery” of dark matter, she said. And Sideræl — pronounced “sigh-deer-ee-el” — is “a more elven” spelling of sidereal, “the true time of the universe, star time, deep space time, not our relative earth time,” she explained.

The singer also said that she and Musk also called the newborn Sailor Mars, a “Sailor Moon” manga reference, and that the name Exa Dark Sideræl was a compromise between her and the Tesla CEO.

“I was fighting for Odysseus Musk,” she told the magazine. “A girl named Odysseus is my dream.”

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