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The Full Roster: All 14 Children Of Elon Musk And The Secret Meanings Behind Their Unique Names

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Elon Musk’s family tree has expanded again, making headlines in the final quarter of 2025 with the confirmation of his 14th child. The tech titan, known for his ventures with Tesla, SpaceX, and X Corp, has consistently captured global attention not just for his business acumen but also for the size and uniquely named members of his growing family. The latest updates, including the announcement of his 14th child, Romulus, and the confirmation of four children with Neuralink executive Shivon Zilis, solidify his status as a major proponent against what he calls "population collapse."

As of December 22, 2025, the full roster of the billionaire’s children now stands at 14, shared across four different mothers. From traditional names like Griffin and Saxon to the highly unconventional monikers like X Æ A-Xii and Techno Mechanicus, the names themselves are a deep dive into the founder's mind—a blend of science fiction, philosophy, and his deep-seated interest in technology and space exploration. This comprehensive guide breaks down every child, their mother, and the recent, often surprising, updates to their lives.

The Complete Biography: Elon Musk's 14 Children in Chronological Order

Elon Musk has fathered 14 children with four different women: Canadian author Justine Wilson, musician Grimes (Claire Elise Boucher), Neuralink executive Shivon Zilis, and conservative writer Ashley St. Clair.

  • Nevada Alexander Musk (Deceased)
    • Mother: Justine Wilson
    • Born: 2002
    • Note: Nevada tragically passed away from Sudden Infant Death Syndrome (SIDS) at just 10 weeks old.
  • Griffin Musk (Twin)
    • Mother: Justine Wilson
    • Born: 2004
    • Note: Griffin and his twin, Vivian, were conceived via IVF.
  • Vivian Jenna Wilson (Twin)
    • Mother: Justine Wilson
    • Born: 2004
    • Note: Vivian legally changed her name in 2022, dropping the 'Musk' surname.
  • Kai Musk (Triplet)
    • Mother: Justine Wilson
    • Born: 2006
    • Note: Kai is one of a set of triplets, also conceived via IVF.
  • Saxon Musk (Triplet)
    • Mother: Justine Wilson
    • Born: 2006
  • Damian Musk (Triplet)
    • Mother: Justine Wilson
    • Born: 2006
  • X Æ A-Xii Musk (Nicknamed X)
    • Mother: Grimes (Claire Elise Boucher)
    • Born: May 2020
    • Note: His name was legally changed from X Æ A-12 to X Æ A-Xii to comply with California law regarding the use of numbers in names.
  • Strider Zilis Musk (Twin)
    • Mother: Shivon Zilis
    • Born: November 2021
    • Note: Strider and his twin, Azure, were born just weeks before the arrival of his half-sister, Exa.
  • Azure Zilis Musk (Twin)
    • Mother: Shivon Zilis
    • Born: November 2021
  • Exa Dark Sideræl Musk (Nicknamed Y)
    • Mother: Grimes (Claire Elise Boucher)
    • Born: December 2021 (via surrogate)
    • Note: Her nickname is "Y," following the pattern of her older brother "X."
  • Techno Mechanicus (Nicknamed Tau)
    • Mother: Grimes (Claire Elise Boucher)
    • Born: 2023
    • Note: The birth of Techno Mechanicus, nicknamed 'Tau,' was quietly confirmed in a biography of Musk.
  • Arcadia Zilis Musk
    • Mother: Shivon Zilis
    • Born: 2024
    • Note: Arcadia is one of the two more recently confirmed children with Zilis.
  • Seldon Lycurgus
    • Mother: Shivon Zilis
    • Born: 2024
    • Note: The name Seldon Lycurgus adds to the list of unique, literary-inspired names.
  • Romulus
    • Mother: Ashley St. Clair
    • Born: September 2024
    • Note: The birth of Romulus was announced by the mother, Ashley St. Clair, in February 2025 on the X platform.

Unlocking the Code: Meaning and Pronunciation of the Unconventional Names

The names of the children Musk shares with Grimes are a masterclass in curiosity-driven naming, drawing heavily on mathematics, aviation, and science fiction. These unique choices often require a detailed explanation, which the parents have occasionally provided, satisfying the public's intense interest.

X Æ A-Xii: The Unknown Variable

The name X Æ A-Xii is perhaps the most famous and confusing of the bunch. It is pronounced "Ex Ash A Twelve" or "Ex Ai A Twelve," depending on whether you ask Musk or Grimes.

  • X: Stands for "the unknown variable."
  • Æ: The Elven spelling of 'AI' (Artificial Intelligence) or 'Love.' Musk himself has suggested it is pronounced "Ash."
  • A-Xii: This part refers to the Lockheed SR-71 Blackbird's predecessor, the A-12 Archangel, which Musk calls his favorite aircraft. The Roman numerals (XII) replaced the number 12 to satisfy California's naming laws.

Exa Dark Sideræl: A Nod to Space and Energy

Exa Dark Sideræl, nicknamed 'Y,' is equally complex and reveals Grimes's deep interest in space and physics.

  • Exa: A reference to the supercomputing term 'ExaFLOPS' (a measure of processing speed), symbolizing the highest level of intelligence.
  • Dark: Refers to 'dark matter,' the mysterious, unseen component of the universe.
  • Sideræl: Pronounced "sigh-deer-ee-el," which Grimes defined as "the true time of the universe, star time, not earth time."

Techno Mechanicus: The Spirit of Innovation

The third child with Grimes, Techno Mechanicus (nicknamed Tau), continues the theme of technology and science. While the parents have offered less public commentary on this name, its meaning is relatively straightforward. 'Techno' is a clear reference to technology and innovation, tying directly to Musk's companies like Tesla and Neuralink. 'Mechanicus' evokes a sense of engineering and the mechanical world, perfectly aligning with the spirit of a SpaceX or Boring Company project.

The Mothers and Musk's Mission Against Population Collapse

The narrative surrounding Elon Musk's large family is inextricably linked to his public pronouncements on the dangers of a declining birth rate. He has repeatedly stated that "population collapse" is a far greater threat to civilization than global warming. His personal life, particularly the recent additions, is often viewed through the lens of this philosophy, making the mothers of his children significant figures in the modern tech and cultural landscape.

Justine Wilson: The First Wife

Justine Wilson, a Canadian author, was Musk's first wife and mother to his first six children. After the tragic loss of their first son, Nevada Alexander, they turned to IVF to have their twins (Griffin and Vivian) and triplets (Kai, Saxon, and Damian). The relationship and subsequent co-parenting arrangement have been public, with Wilson providing an early look into the challenges of raising a large family with a high-profile figure.

Grimes (Claire Elise Boucher): The Artistic Partner

Musician Grimes is the mother of three of Musk’s children: X, Y, and Tau. Their relationship was characterized by a shared interest in futuristic concepts, leading to the highly conceptual names for their children. Despite their on-again, off-again relationship and eventual split, they have maintained a co-parenting dynamic centered around their children’s welfare and unique upbringing.

Shivon Zilis: The Neuralink Executive

Shivon Zilis is a high-ranking executive at Musk's brain-chip company, Neuralink, and the mother of four of his children: twins Strider and Azure, and the younger two, Arcadia and Seldon. The birth of the twins in late 2021 was a surprise to the public, further emphasizing Musk's commitment to having a large family. Zilis herself has publicly stated her support for Musk's views on the birth rate crisis, reinforcing the connection between their personal choices and the broader philosophical mission of the tech entrepreneur.

Ashley St. Clair: The Newest Mother

The latest confirmed mother is conservative writer and influencer Ashley St. Clair, who announced in early 2025 that she had welcomed a son, Romulus, with Musk in September 2024. This newest addition, coupled with the previously unconfirmed children with Zilis, brings the total number to 14, cementing the Musk family as one of the largest and most talked-about celebrity families in the world. The continued expansion of his family is a real-world manifestation of his belief that people should have more children to secure the future of civilization.

elon musk's kids names
elon musk's kids names

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