The Three Musk-eteers: Everything To Know About Grimes And Elon Musk's Children And Their Unique Names
The relationship between Canadian musician Grimes and tech mogul Elon Musk has always been a source of public fascination, but nothing has captured global attention quite like the unique names of their children. As of December 2025, the former couple shares three children, each with a name that reads more like a science fiction novel or a mathematical equation than a traditional moniker. This in-depth article will explore the latest details on their three children—X, Y, and Tau—and provide a complete profile of the unconventional parents who brought them into the world.
The names themselves—X Æ A-Xii, Exa Dark Sideræl, and the recently revealed Techno Mechanicus—are a direct reflection of their parents’ shared interests in artificial intelligence, space, and a post-human future. With new details about their third child emerging as recently as late 2023, the family saga continues to evolve, confirming their status as one of the most talked-about co-parenting duos in the world. The complexity of their family structure is a modern-day curiosity, blending high-tech futurism with the challenges of a public, on-again, off-again romance.
The Parents: Grimes and Elon Musk Biography & Profile
The dynamic between Grimes and Elon Musk is a convergence of art and science, a pairing that defines the 21st-century celebrity landscape. Their individual biographies are as complex and high-achieving as their relationship.
Claire Elise Boucher (Grimes)
- Born: March 17, 1988, in Vancouver, British Columbia, Canada.
- Occupation: Musician, singer, songwriter, record producer, music video director, and visual artist.
- Genre: Known for her eclectic fusion of dream pop, synth-pop, electronic, and R&B.
- Career Highlights: Major breakthrough with the album *Visions* (2012); critical acclaim for *Art Angels* (2015); released her "last Earth album," *Miss Anthropocene* (2020), which explores themes of climate change personified as a goddess.
- Artistic Style: Her music and visual art are heavily influenced by science fiction, futurism, and Japanese anime.
Elon Reeve Musk
- Born: June 28, 1971, in Pretoria, South Africa.
- Occupation: Entrepreneur, investor, and business magnate.
- Key Companies: Co-founder of PayPal; CEO of SpaceX, CEO of Tesla, Inc., and owner/CTO of X (formerly Twitter).
- Vision: A prominent figure in the space exploration industry, aiming to reduce global warming through sustainable energy production and consumption, and to establish a human colony on Mars.
- Family Life: Father to at least 14 children with four different women, including his first wife, Justine Wilson, Grimes, and Neuralink executive Shivon Zilis.
The Three Children: Names, Meanings, and Birth Details
Grimes and Elon Musk share three children whose names are a deliberate blend of mathematics, aviation, and celestial mythology. The revelation of each child’s name sparked a global conversation, instantly cementing their status in the pantheon of unique celebrity baby names.
1. X Æ A-Xii Musk (Nickname: 'X')
Birth Date: May 4, 2020
X Æ A-Xii, often simply referred to as "X," was the first child born to the couple. The name immediately caused confusion and a legal issue, as California law restricts the use of numbers and symbols in a registered name, leading to a slight modification from the original "X Æ A-12."
The Meaning Behind the Code
- X: Stands for "the unknown variable." This is the simplest part of the name.
- Æ: According to Grimes, this is the Elven spelling of "AI," which is an abbreviation for both "artificial intelligence" and "love."
- A-Xii: This part is a reference to the Lockheed SR-71 Blackbird, a high-altitude reconnaissance aircraft that Musk is known to be a fan of. The "A" also stands for "Archangel," which Grimes has cited as her favorite song.
Pronunciation: Musk himself clarified the pronunciation, stating it is "Ex-Ash-Twelve."
2. Exa Dark Sideræl Musk (Nickname: 'Y')
Birth Date: December 2021 (Born via surrogate, revealed in March 2022)
The existence of their second child, a daughter, was a complete surprise to the public, revealed during a 2022 interview with *Vanity Fair*. Exa Dark Sideræl, or 'Y,' was born via surrogate, a detail that further complicated the timeline of the couple's on-again, off-again relationship.
The Celestial and Computational Meanings
- Exa: A reference to the term "Exa-flop," a unit of computing speed used in supercomputing, linking back to Musk’s technological interests.
- Dark: Represents "the unknown." Grimes described it as "the dark matter," the beautiful mystery of the universe that is not yet understood.
- Sideræl: Pronounced "sigh-deer-ee-elle," this term is described as "the true time of the universe, star time, not our relative earth time." Grimes also noted its connection to the Elven language, mirroring the theme in X’s name.
3. Techno Mechanicus Musk (Nickname: 'Tau')
Birth Date: June 2022 (Publicly revealed in September 2023)
The third child, a son named Techno Mechanicus, was the most secretly guarded, with his existence only revealed through the publication of Walter Isaacson's biography of Elon Musk in September 2023. This revelation confirmed that the couple had quietly welcomed a third child, born months after their daughter 'Y.'
The Mathematical and Futuristic References
- Techno Mechanicus: This highly specific name is widely believed to be a direct nod to the *Warhammer 40,000* universe, a shared interest between the parents. The "Adeptus Mechanicus" are a faction of "Tech-Priests" who worship the Machine God, linking to themes of technology and futurism.
- Tau: The child's nickname is "Tau," which in mathematics is a term associated with the constant $2\pi$ (two pi). Some sources suggest this is a reference to the child's June 28th birthday, which is approximately $2\pi$ (6.28) months into the year, or perhaps a more narcissistic reference to Musk's own birthday.
The Complex Co-Parenting Dynamic and Public Clashes
Despite the end of their romantic relationship, Grimes and Elon Musk continue to navigate a complex co-parenting arrangement for their three children. This dynamic has frequently spilled into the public sphere, providing a rare, unfiltered look into their post-split life.
In late 2023 and throughout 2024, the co-parenting relationship was described as contentious, marked by a highly publicized social media plea from Grimes. Grimes publicly requested that Musk allow her to see her son, X, and to communicate more effectively, indicating a period of significant strain. She also accused Musk of "silly" social media moves, highlighting the difficulty of maintaining a private family life while one parent is the owner of the platform itself (X/Twitter).
The drama surrounding their family life, including a legal dispute over parental rights, underscores the challenges of co-parenting in the modern, hyper-public era. While they maintain a cooperative parenting approach, the unique circumstances of their lives—a billionaire CEO and an avant-garde musician—ensure that their family structure remains anything but traditional. Their shared focus on the children's well-being, despite their personal differences, remains a central theme, with the children's unique names serving as a constant reminder of their parents' shared, futuristic vision.
The names X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus are not just names; they are statements about technology, futurism, and the unknown. They are living entities that embody the unique intersection of art and science that defines their parents, Grimes and Elon Musk. The world continues to watch as these three "Musk-eteers" grow up, undoubtedly shaping a future as unconventional as their monikers.
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