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The Chaotic Life Of X Æ A-Xii: 7 Shocking Facts About Elon Musk’s Eldest Son With Grimes

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The world has been captivated by the children of tech mogul Elon Musk, but none more so than his eldest son with musician Grimes, whose name has become a global phenomenon. As of the current date, December 21, 2025, 'X'—the nickname for X Æ A-Xii—continues to be one of the most talked-about celebrity children, embodying a unique blend of high-tech futurism and chaotic celebrity co-parenting. This article dives deep into the most recent, often bizarre, and always fascinating details of his life, from the legal battles over his name to the revelation of his secret siblings. The intense public curiosity surrounding X Æ A-Xii stems from the sheer unconventionality of his existence, a perfect reflection of his parents' boundary-pushing personas. Born into a world of rockets, artificial intelligence, and avant-garde music, his life is anything but ordinary, constantly providing fresh headlines and fueling global speculation about the future of celebrity parenting.

Biography and the Complete Musk Family Tree

X Æ A-Xii, often simply referred to as 'X', is the son of entrepreneur Elon Musk and Canadian musician Claire Elise Boucher, known professionally as Grimes. His birth instantly made headlines, not for who his parents were, but for the name they chose.

X Æ A-Xii (X) Profile

  • Full Name (Current Legal): X Æ A-Xii Musk
  • Original Name: X Æ A-12 Musk
  • Nickname: X
  • Date of Birth: May 4, 2020
  • Mother: Claire Elise Boucher (Grimes)
  • Father: Elon Musk
  • Siblings (with Grimes): Exa Dark Sideræl Musk ('Y') and Techno Mechanicus ('Tau')

The Full List of Elon Musk's Children (The Musk-eteers)

As of late 2025, Elon Musk is a father to at least 11 living children with three different women. The sheer size and complexity of his family unit is a key part of the current narrative surrounding the tech billionaire, establishing significant topical authority in any discussion of his life.

  • With Justine Wilson (Author):
    • Nevada Alexander Musk (Born 2002, died at 10 weeks from SIDS)
    • Griffin Musk (Twin, born 2004)
    • Vivian Jenna Wilson (Twin, born 2004, formerly Xavier Alexander Musk)
    • Kai Musk (Triplet, born 2006)
    • Saxon Musk (Triplet, born 2006)
    • Damian Musk (Triplet, born 2006)
  • With Grimes (Claire Elise Boucher):
    • X Æ A-Xii Musk ('X', born 2020)
    • Exa Dark Sideræl Musk ('Y', born 2021 via surrogate)
    • Techno Mechanicus Musk ('Tau', born later, revealed in 2023)
  • With Shivon Zilis (Neuralink Executive):
    • Strider Musk (Twin, born 2021)
    • Azure Musk (Twin, born 2021)

The Name Game: Why X Æ A-12 Became X Æ A-Xii

The name X Æ A-12 was never going to be simple, but the subsequent legal and phonetic chaos made it a cultural flashpoint. When Musk first announced the name, the world scrambled for a pronunciation guide, which Grimes later provided: "X like the letter, Æ pronounced 'Ash,' and A-12 is 'Archangel 12,' the precursor to the SR-71." The controversy, however, quickly became a legal one. California state law, where the child was born, dictates that names on a birth certificate must use characters from the English alphabet. Numbers, like the '12' in A-12, are prohibited.

The Legal Fix and Roman Numerals

To circumvent the state's naming restrictions while keeping the essence of their original choice, the parents made a slight but significant change. The '12' was replaced with the Roman numerals 'Xii'. The full legal name officially became X Æ A-Xii Musk. The birth certificate lists the first name as "X," the middle name as "Æ A-Xii," and the last name as "Musk." This change allowed the name to be legally registered while maintaining the futuristic, code-like aesthetic his parents desired.

X's Secret Siblings: The 'Y' and 'Tau' Revelations

For years, the public believed X Æ A-Xii was the only child of the Musk-Grimes relationship, but recent revelations have proven that assumption wildly inaccurate. The couple, who share an on-again, off-again relationship status, quietly welcomed two more children, adding to the complexity of the Musk family tree.

Exa Dark Sideræl (Nickname 'Y')

In December 2021, Grimes and Musk welcomed a second child via a surrogate, a daughter named Exa Dark Sideræl. This name, like her brother's, is steeped in technical and philosophical references:

  • Exa: A reference to exaFLOPS, a unit of computing power, tying into Musk's tech empire.
  • Dark: A reference to the unknown and the "beautiful mystery of the universe."
  • Sideræl: A "more elven" spelling of sidereal, meaning relating to distant stars.

She is often referred to by the simple nickname 'Y', continuing the trend of single-letter monikers.

Techno Mechanicus (Nickname 'Tau')

The biggest surprise came with the revelation of a third child, a son named Techno Mechanicus, who is affectionately nicknamed 'Tau'. The existence of 'Tau' was confirmed in late 2023, making X Æ A-Xii a middle child of the Grimes-Musk trio. The name choice follows the same theme of advanced technology and mathematical/philosophical concepts, as 'Tau' is the 19th letter of the Greek alphabet and a common symbol in science and engineering.

The Latest Co-Parenting Drama and Public Appearances

While X Æ A-Xii's name and siblings are fascinating, the most current news often revolves around the dynamic between his parents. Despite their separation, Musk and Grimes continue to co-parent their three children, a situation that has recently played out publicly on Musk's social media platform, X (formerly Twitter).

The 'Blocked on X' Controversy

In a bizarre public spat, Grimes claimed in a post that Elon Musk had blocked her on X. She expressed frustration that while they are actively co-parenting three children, he would cut off her communication via the platform he owns. This public disagreement highlighted the often-strained and unconventional nature of their post-relationship dynamic, which directly impacts the environment X is being raised in.

Life in the Public Eye

Despite his young age, X has been frequently seen by his father's side at various high-profile events, a rarity for Musk's other children. He has been photographed accompanying his father at SpaceX facilities, business meetings, and even inside the Oval Office during a visit to the White House. These appearances suggest X is being introduced to the world of his father's ventures early on, a unique upbringing that sets him apart from most celebrity children.

The life of X Æ A-Xii is a continuous, unfolding narrative that perfectly mirrors the futuristic ambitions and personal drama of his parents. From the legal battle over his Roman numeral name to the revelation of his secret siblings 'Y' and 'Tau', X is a symbol of the new era of celebrity, where the boundaries between technology, art, and family are constantly being redefined.

elon musk son x
elon musk son x

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