Elon Musk’s 14 Children: A Complete List Of Names, Ages, And The Futuristic Meanings Behind X Æ A-Xii, Exa Dark Sideræl, And Techno Mechanicus

The world's most famous futurist and tech mogul, Elon Musk, has expanded his family to a remarkable 14 children, a figure that continues to capture global attention as of December 10, 2025. The latest updates confirm a continually growing family tree, featuring a mixture of traditional and famously unique, futuristic names that reflect his passion for science, technology, and space exploration. This comprehensive guide breaks down every child's name, their mother, and the fascinating—and often cryptic—meanings behind the most unconventional monikers.

Musk’s vision for humanity's future, from colonizing Mars with SpaceX to merging man with machine via Neuralink, is paralleled by his personal life. The names of his children, particularly those shared with musician Grimes, serve as a testament to his unique worldview, turning his family into one of the most discussed topics in the celebrity and tech spheres.

Elon Musk: A Brief Biographical Profile

Elon Reeve Musk is a South African-born Canadian-American business magnate, investor, and engineer, renowned for his pivotal role in several world-changing companies. His life story is a blend of entrepreneurial genius and relentless ambition, which has cemented his status as a modern-day industrialist.

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• Born: June 28, 1971, in Pretoria, South Africa.
• Education: He taught himself computer programming early on, later attending Queen's University in Canada and then transferring to the University of Pennsylvania, where he earned degrees in physics and economics.
• Key Companies Founded/Co-Founded: Zip2, X.com (later PayPal), SpaceX, Tesla, Neuralink, The Boring Company, and xAI.
• Current Roles: CEO of SpaceX, CEO of Tesla, Owner and CTO of X (formerly Twitter), and CEO of xAI.

The Complete List of Elon Musk's 14 Children and Their Mothers

Musk’s 14 children are from four different women: his first wife, novelist Justine Wilson; musician and artist Grimes (Claire Boucher); Neuralink executive Shivon Zilis; and a recently reported fourth mother. The timeline of births spans over two decades, featuring twins, triplets, and a series of secret births that have only recently come to light, making the total count a frequent subject of media updates.

Children with Justine Wilson (5 Children)

Musk's first foray into fatherhood was with his first wife, Justine Wilson. The couple had six children, though their firstborn tragically passed away.

• Nevada Alexander Musk (2002): Tragically passed away from SIDS at 10 weeks old.
• Griffin Musk (2004): Twin to Vivian.
• Vivian Jenna Wilson (2004): Twin to Griffin, she legally changed her name in 2022 to distance herself from her father and reflect her gender identity.
• Kai Musk (2006): Triplet.
• Saxon Musk (2006): Triplet.
• Damian Musk (2006): Triplet.

Children with Grimes (3 Children)

The three children shared with Grimes are the most famous for their unconventional, sci-fi-inspired names, often incorporating mathematical symbols and Elven language references.

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• X Æ A-Xii Musk (Born 2020): Originally named X Æ A-12, the name was changed slightly to comply with California law, which prohibits numbers in a name. Nicknamed "X."
• Exa Dark Sideræl Musk (Born December 2021): Born via surrogate. Nicknamed "Y."
• Techno Mechanicus Musk (Born June 2022): Revealed in Walter Isaacson's 2023 biography. Nicknamed "Tau."

Children with Shivon Zilis (4 Children)

Shivon Zilis, a director at Neuralink, and Musk welcomed twins secretly in 2021, and two more children in late 2024/early 2025, bringing their total to four.

• Strider Sekhar Sirius Musk (Born November 2021): Twin to Azure.
• Azure Astra Alice Musk (Born November 2021): Twin to Strider.
• Seldon Lycurgus Musk (Announced Feb/Mar 2025): One of the two latest additions, likely a reference to historical or fictional figures (Hari Seldon from Asimov's Foundation and Lycurgus, the Spartan lawgiver).
• Arcadia Musk (Latest Addition): The name Arcadia has been mentioned in recent reports as the fourth child with Zilis.

Latest Confirmed Child (1 Child)

Recent reports from early 2025 suggest another child, Romulus, was born to an unnamed mother, bringing the total count to 14.

• Romulus Musk (Reported April 2025): A name with deep historical significance, referencing one of the legendary founders of Rome.

Unpacking the Sci-Fi and Technical Meanings of the Unique Names

The children Musk shares with Grimes possess names that are less traditional and more akin to complex code or references from deep space and science fiction. Understanding the etymology of these names provides a fascinating glimpse into the mind of the SpaceX founder.

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X Æ A-Xii: The Code Name Explained

The name of his eldest son with Grimes, originally X Æ A-12, is a blend of symbols and references. The change from "12" to the Roman numeral "Xii" was a legal necessity in California, which only permits the 26 letters of the English alphabet.

• X: Represents "the unknown variable."
• Æ: Grimes stated this is the Elven spelling of "AI," which stands for both Artificial Intelligence and the word "love" in several languages.
• A-Xii: Refers to the "Archangel-12," the internal name for the SR-71 Blackbird, the couple's favorite aircraft, which is "great, non-violent."

Exa Dark Sideræl: A Cosmic and Computational Name

Exa Dark Sideræl, or "Y," is a name rooted in computational science and the cosmos, reflecting a highly technical and philosophical background.

• Exa: A reference to "exaFLOP," a unit of computing speed used in supercomputing.
• Dark: Symbolizes "the unknown," specifically dark matter and dark energy, which constitute the majority of the universe.
• Sideræl: Pronounced "sigh-deer-ee-el," Grimes noted that it is a more "Elven" spelling of "sidereal," meaning "of the stars."

Techno Mechanicus: The Tech-Worshipper

The youngest child with Grimes, nicknamed "Tau," also carries a name with clear technical and sci-fi undertones, further integrating the family with the world of futurism.

• Techno: Likely a nod to the electronic music genre, reflecting Grimes's artistic background.
• Mechanicus: A reference that many fans believe is a direct homage to the "Adeptus Mechanicus," a faction of tech-worshippers from the popular sci-fi universe of Warhammer 40,000.

The Future of the Musk Family Tree

The rapid expansion of the Musk family, particularly the secret births with Shivon Zilis and the latest reported additions of Romulus and Seldon Lycurgus, demonstrates a clear, stated personal mission by the billionaire: to combat the global problem of underpopulation. Musk has frequently voiced his concerns about declining birth rates, viewing it as one of the biggest threats to human civilization.

The names chosen for his children—from the traditional (Griffin, Saxon) to the highly conceptual (X Æ A-Xii, Exa Dark Sideræl)—create a unique family narrative that is deeply intertwined with his professional ventures in space, AI, and technology. As the family continues to grow, the world remains keenly interested in the next "Musk-eteer" and the philosophical or technological clue embedded in their name. The sheer number of children, combined with the groundbreaking nature of their names, ensures that the Musk family will remain a central point of discussion for years to come.