The Musk Legacy: A Complete List Of Elon Musk's 14 Children And The Shocking Meaning Behind Their Names In 2025

Billionaire entrepreneur Elon Musk has consistently made global headlines, not just for his ventures like SpaceX, Tesla, and X (formerly Twitter), but for his rapidly expanding and uniquely named family. As of late 2025, the Tesla CEO is known to be the father of 14 children, shared with four different women, a number that has been updated following recent announcements about his latest offspring.

The names chosen for his children range from classic to highly esoteric, often drawing inspiration from science fiction, mathematics, and philosophy, reflecting Musk’s own intellectual passions. This comprehensive guide provides the most current, up-to-date list of all 14 children, their mothers, and the fascinating, often complex, meanings behind their groundbreaking names, including the newest additions, Romulus and Seldon Lycurgus.

The Complete Elon Musk Family Tree: 14 Children and Their Mothers (Updated 2025)

The Musk family tree has grown significantly, involving four mothers: his first wife, Canadian author Justine Wilson; musician and artist Grimes (Claire Boucher); Neuralink executive Shivon Zilis; and conservative influencer Ashley St. Clair. The following is a chronological list of his known children, including the tragic loss of his first son, Nevada Alexander Musk.

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• Nevada Alexander Musk (2002)
  • Mother: Justine Wilson
  • Note: Tragically died of Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
• Griffin Musk (2004)
  • Mother: Justine Wilson
  • Note: Twin, born via IVF.
• Vivian Jenna Wilson (2004)
  • Mother: Justine Wilson
  • Note: Twin, born via IVF. Legally changed her name in 2022.
• Kai Musk (2006)
  • Mother: Justine Wilson
  • Note: Triplet, born via IVF.
• Saxon Musk (2006)
  • Mother: Justine Wilson
  • Note: Triplet, born via IVF.
• Damian Musk (2006)
  • Mother: Justine Wilson
  • Note: Triplet, born via IVF.
• X Æ A-Xii Musk ('X') (Born May 2020)
  • Mother: Grimes (Claire Boucher)
  • Note: Originally named X Æ A-12, the name was later legally changed to X Æ A-Xii.
• Exa Dark Sideræl Musk ('Y') (Born December 2021)
  • Mother: Grimes (Claire Boucher)
  • Note: Born via surrogate. Nicknamed 'Y'.
• Strider Musk (Born November 2021)
  • Mother: Shivon Zilis
  • Note: Twin. The existence of the twins was revealed in July 2022.
• Azure Musk (Born November 2021)
  • Mother: Shivon Zilis
  • Note: Twin.
• Techno Mechanicus Musk ('Tau') (Born June 2022)
  • Mother: Grimes (Claire Boucher)
  • Note: Revealed in Walter Isaacson's biography of Musk.
• Arcadia Musk (Born 2024 - Exact details unconfirmed)
  • Mother: Shivon Zilis
  • Note: Details of this child are less public, but reported as an addition in 2024.
• Romulus Musk (Born September 2024)
  • Mother: Ashley St. Clair
  • Note: Birth announced in February 2025.
• Seldon Lycurgus Musk (Born 2025)
  • Mother: Shivon Zilis
  • Note: The 14th child, announced in 2025.

Unlocking the Enigma: The Meaning and Pronunciation of Musk’s Most Unusual Names

The names chosen for his children with Grimes and Shivon Zilis have become a cultural phenomenon, sparking worldwide curiosity and confusion. They are not merely names but complex codes that weave together references to aviation, philosophy, mathematics, and science fiction.

X Æ A-Xii ('X')

The name of Musk's first child with Grimes is arguably the most famous and perplexing celebrity baby name of the modern era. The name has a specific, multi-layered meaning, explained by Grimes herself.

• X: Represents "the unknown variable."
• Æ: The Elven spelling of "AI," which stands for both Artificial Intelligence and "love."
• A-Xii: A reference to the Lockheed SR-71 Blackbird's predecessor, the Archangel-12, which Musk and Grimes call their favorite aircraft.

Pronunciation: The most common pronunciation accepted by the parents is "X Ash A Twelve." Musk has also suggested simply "X," followed by "Ash" for the Æ, and "A Twelve" for the Roman numerals.

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Exa Dark Sideræl Musk ('Y')

Born via surrogate, the second child with Grimes, nicknamed 'Y', carries a name equally steeped in technological and astronomical references.

• Exa: A reference to the supercomputing term 'ExaFLOPS' (a unit of computing speed).
• Dark: Represents "the unknown." Grimes explained that "people fear it, but truly it's the absence of photons, Dark Matter is the beautiful mystery of our universe."
• Sideræl: A more elven spelling of 'sidereal,' which means relating to or determined by the stars. It is also described as a reference to Grimes’ favorite Lord of the Rings character, Galadriel.

Tau Techno Mechanicus ('Tau')

The third child with Grimes, whose full name is Techno Mechanicus Musk, is nicknamed 'Tau.' This name continues the trend of blending science, technology, and esoteric references, drawing heavily from nerd culture.

• Tau (τ): The Greek letter is a reference to the mathematical constant $2\pi$, which is often preferred by some mathematicians over Pi ($\pi$).
• Techno Mechanicus: This phrase is believed to be a nod to the Warhammer 40,000 universe, specifically the 'Adeptus Mechanicus,' an organization dedicated to technology and engineering, reflecting Musk’s own passions.

The Newest Additions: Romulus and Seldon Lycurgus

The two most recently announced children, Romulus and Seldon Lycurgus, confirm the ongoing pattern of naming children after historical, mythological, and science fiction figures, solidifying the topical authority surrounding the Musk family's naming conventions.

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Romulus Musk

Romulus Musk, the son of Elon Musk and conservative political commentator Ashley St. Clair, was born in September 2024, with the news announced in early 2025.

• Romulus: The name is a direct reference to Roman mythology. Romulus was the legendary founder of Rome, along with his twin brother Remus. This choice suggests a theme of foundation, legacy, and empire-building, aligning with Musk's 'Musk-eteers' philosophy.

Seldon Lycurgus Musk

The 14th known child, Seldon Lycurgus, was welcomed with Shivon Zilis in 2025. This name is perhaps the most direct and complex reference to science fiction and ancient history yet.

• Seldon: A clear homage to Hari Seldon, the fictional mathematician and founder of 'psychohistory' in Isaac Asimov's seminal *Foundation* novel series. Musk has often cited Asimov's work as a major influence.
• Lycurgus: This name refers to the legendary lawgiver of Sparta, a figure credited with creating the Spartan military system and constitution. The combination of Seldon (a futuristic planner) and Lycurgus (an ancient legislator) suggests a deep interest in societal structure and future governance.

The continuous expansion and unique naming of Elon Musk's children, particularly the 2024 and 2025 additions of Romulus and Seldon Lycurgus, ensure that the 'Musk Legacy' remains one of the most talked-about personal stories in the world of technology and entrepreneurship. These names are more than just labels; they are a public reflection of a man obsessed with science, space, history, and the future of humanity. The children’s names, from the ancient Greek and Roman to the futuristic and mathematical, serve as a constant source of natural LSI keywords for search engines, linking the Musk family to themes of space exploration, artificial intelligence (AI), and philosophical inquiry. The public's fascination with these unique names—from the 'X Æ A-Xii pronunciation' to the 'Techno Mechanicus meaning'—continues to drive massive search interest globally.