The Unbelievable Names And Current Ages Of Grimes And Elon Musk's 3 Children: X, Y, And Tau

The family life of musician Grimes and tech mogul Elon Musk has consistently captivated the public, primarily due to their unconventional approach to everything, especially naming their children. As of December 2025, the former couple shares three children, each bearing a name that sounds more like a cryptic code or a science-fiction entity than a traditional moniker: X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus. This article delves into the latest updates, current ages, and the bizarre, fascinating meanings behind these names, alongside the recent, dramatic conclusion of their highly publicized custody dispute.

Their relationship, though officially ended, continues to generate headlines, particularly as the children grow and their unique names become a permanent fixture in celebrity culture. The recent legal battles and the sheer complexity of their family structure confirm that Grimes and Musk are intent on raising a new generation of unconventional thinkers.

Claire Elise Boucher (Grimes) Full Biography and Profile

Grimes, whose legal name is Claire Elise Boucher, is a Canadian artist known for her eclectic musical style, which fuses elements of synth-pop, electronic music, art-pop, and R&B. Her work is often characterized by ethereal vocals and complex, futuristic soundscapes.

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• Full Name: Claire Elise Boucher
• Stage Name: Grimes (also sometimes referred to as 'c')
• Date of Birth: March 17, 1988
• Age (as of Dec 2025): 37 years old
• Place of Birth: Vancouver, British Columbia, Canada
• Occupation: Musician, Singer, Songwriter, Record Producer, Visual Artist
• Genre: Art Pop, Electronic, Synth-pop, Dream Pop
• Notable Albums: *Visions*, *Art Angels*, *Miss Anthropocene*
• Partner History: Elon Musk (2018–2021, on-again/off-again)

Boucher adopted the stage name Grimes in 2010. She gained significant critical acclaim with her third studio album, *Visions*, in 2012. Her artistic persona is deeply intertwined with themes of technology, science fiction, and mythology, which is clearly reflected in the names chosen for her children with Elon Musk.

The Three Children of Grimes and Elon Musk: Names, Ages, and Meanings

Grimes and Elon Musk share three children. Each child's name is a deliberate statement, combining esoteric references to technology, aviation, and cosmology. Here is the definitive breakdown of their three kids, with ages calculated for December 2025:

1. X Æ A-Xii (Nickname: X)

The first child's name instantly became a global sensation and a source of endless confusion. Originally named X Æ A-12, the name was later legally changed to X Æ A-Xii due to California state law restrictions on using numerals in names.

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• Full Name: X Æ A-Xii Musk
• Nickname: X
• Date of Birth: May 4, 2020
• Current Age (Dec 2025): 5 years old
• The Meaning: Grimes explained the name's components. 'X' stands for the "unknown variable." 'Æ' is the Elven spelling of 'AI' (artificial intelligence and/or love). 'A-Xii' (or A-12) refers to the Lockheed A-12, the precursor to the SR-71 Blackbird, which the couple affectionately calls their favorite aircraft—a plane with "no weapons, no defenses, just speed."

2. Exa Dark Sideræl (Nickname: Y)

The couple's second child, a daughter, was born via surrogate in late 2021, a detail that was initially kept private. Her name is arguably even more complex and cosmic than her brother's.

• Full Name: Exa Dark Sideræl Musk
• Nickname: Y (pronounced 'Why')
• Date of Birth: December 2021
• Current Age (Dec 2025): 4 years old
• The Meaning: The name is a direct nod to science and the universe. 'Exa' refers to exaFLOP, a term in supercomputing. 'Dark' is a reference to dark matter, the mysterious, unseen force that makes up most of the universe. 'Sideræl' is an elven spelling of 'sidereal,' which means the true time of the universe, contrasting with earthly solar time.

3. Techno Mechanicus (Nickname: Tau)

The existence of a third child, a son, was kept completely secret until September 2023, when it was revealed in Walter Isaacson's biography of Elon Musk. He was also born via surrogate.

• Full Name: Techno Mechanicus Musk
• Nickname: Tau (pronounced 'T-ow')
• Date of Birth: June 2022
• Current Age (Dec 2025): 3 years old
• The Meaning: While the full, official breakdown has not been detailed by Grimes, the name is clearly rooted in technology and engineering. 'Techno' and 'Mechanicus' suggest a deep connection to machinery, a recurring theme for the couple, and a playful embrace of the futuristic. 'Tau' is the 19th letter of the Greek alphabet, often used in mathematics and science.

The Sealed Custody Battle and Its Aftermath

The complexities of their relationship culminated in a highly contentious and public legal battle over the custody of their three children in 2023. The dispute involved filings in both Texas (by Elon Musk) and California (by Grimes), highlighting the challenges of co-parenting across state lines and different legal jurisdictions.

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The conflict was deeply personal and stressful for the musician. Grimes publicly stated that the "brutal" custody battle was driving her to despair and that she was "going bankrupt" fighting for her children. She even claimed at one point she had not seen one of her children for five months, underscoring the severity of the dispute.

The legal proceedings were eventually sealed, closing the courtroom to the public and press in December 2023. However, the most recent update confirms that a final settlement was reached in Travis County, Texas, with a final order issued in August 2024. While the specifics of the child support and visitation agreement remain confidential due to the sealed records, the settlement marks the formal conclusion of the legal conflict, allowing both parents to move forward with the agreed-upon co-parenting arrangement for X, Y, and Tau.

The names of Grimes and Elon Musk’s children—X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus—will forever be tied to a period of intense technological fascination and personal upheaval. As the children grow, they are certain to be among the most unique and closely watched figures of the next generation, each name a living testament to their parents' unique blend of art, science, and futurism.