

- Elon Musk announced that Grimes had given birth to their first child together on Monday, May 4.
- Musk later shared the baby's name: X Æ A-12 Musk.
- Grimes confirmed the name in a tweet Tuesday night, explaining that each element had personal significance to the couple.
Elon Musk announced the arrival of his first child with girlfriend Grimes on Monday, May 4, tweeting, "Mom & baby all good." (Musk also has five sons from his previous marriage to Justine Musk.) He subsequently tweeted the newborn's name: X Æ A-12 Musk.
In Grimes' first tweet since the baby, her first child, was born, she confirmed the name, explaining each individual element and what it means to the couple. "X, the unknown variable," she tweeted. "Æ, my elven spelling of Ai (love &/or Artificial intelligence)."
"A-12" is an military airplane reference, Grimes (real name Claire Boucher) explained. The Lockheed A-12 is a now retired reconnaissance aircraft built for the CIA in the 1960s. "No weapons, no defenses, just speed. Great in battle, but non-violent," Grimes tweeted. The aircraft was known as Archangel during development, according to the BBC—and "Archangel" also happens to be Grimes' favorite song, she added. (A little internet sleuthing indicates she's referring to "Archangel" by Burial.)
•X, the unknown variable ⚔️•Æ, my elven spelling of Ai (love &/or Artificial intelligence)•A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent 🤍+ (A=Archangel, my favorite song) (⚔️🐁 metal rat)May 6, 2020
For more stories like this, including celebrity news, beauty and fashion advice, savvy political commentary, and fascinating features, sign up for the Marie Claire newsletter.
RELATED STORIES
Stay In The Know
Marie Claire email subscribers get intel on fashion and beauty trends, hot-off-the-press celebrity news, and more. Sign up here.

Emily Dixon is a British journalist who’s contributed to CNN, Teen Vogue, Time, Glamour, The Guardian, Wonderland, The Big Roundtable, Bust, and more, on everything from mental health to fashion to political activism to feminist zine collectives. She’s also a committed Beyoncé, Kacey Musgraves, and Tracee Ellis Ross fan, an enthusiastic but terrible ballet dancer, and a proud Geordie lass.
-
The 32 Funniest Actors (Who Aren't Actually Comedians)
But you'd never know it.
By Katherine J. Igoe
-
32 of the Most Iconic Hollywood Friendships
Some have been going strong for decades.
By Katherine J. Igoe
-
Behold: Ciara’s Golden Flecked Baby Bump
Now *that's* how you do maternity fashion with flair.
By India Roby
-
Sarah Hyland and Adam Devine Play 'How Well Do You Know Your Co-Star?'
The 'Modern Family' stars reunited for the 'Pitch Perfect' spinoff series.
By Brooke Knappenberger
-
The 78 Best Celebrity Couple Halloween Costumes of All Time
Honestly, we're impressed.
By Charlotte Chilton
-
Super Rare Photos of Queen Elizabeth as a Young Woman
From childhood snapshots to portraits as a young princess, beautiful and rare photos of the late Queen Elizabeth as a young woman.
By Mehera Bonner
-
King Charles III and Queen Consort Camilla's Relationship: A Timeline
With the passing of Queen Elizabeth II, Charles has ascended to the throne as king.
By The Editors
-
Who Is Next in Line for the British Throne, Explained
And yes—Harry and Archie are still in the line of succession.
By Andrea Park
-
Who Is Alexandria Ocasio-Cortez's Fiancé Riley Roberts?
AOC's husband-to-be is an "easygoing redhead" who lives with her in D.C.
By Katherine J. Igoe
-
68 Times the Kardashians Posed Fully Nude and Owned It
And we mean fully nude—as in, not a shred of clothing.
By Bianca Rodriguez
-
Who Is Jonathan Owens, Simone Biles's Fiancé and NFL Player?
"The easiest yes!" Simone wrote about the couple's engagement.
By The Editors