The Definitive List Of Elon Musk’s 14 Children: Names, Mothers, And The Meaning Behind X Æ A-Xii And Romulus

The world's richest man and tech mogul, Elon Musk, is known as much for his ambitious ventures into space and electric vehicles as he is for his large, rapidly growing family. As of late 2024 and early 2025, the total number of his children has reached 14, shared with four different women, making his personal life a subject of intense global curiosity and media attention. This comprehensive guide provides the most current and verified list of all his children, their unique names, and the fascinating stories behind them.

The latest updates, including the confirmation of a new son named Romulus in early 2025 and the full roster of four children with Neuralink executive Shivon Zilis, solidify the current count. The unusual, often technological or philosophical names chosen for his children reflect the visionary and unconventional nature of the SpaceX and Tesla CEO, offering a rare glimpse into the man behind the world-changing companies.

Elon Reeve Musk: A Biographical Snapshot (Updated 2025)

The father of 14, Elon Musk, has cemented his status not just as a business leader but as a figure deeply invested in the future of humanity and population growth. His personal details are frequently updated alongside his fluctuating wealth and new ventures.

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• Full Name: Elon Reeve Musk
• Date of Birth: June 28, 1971
• Current Age (as of December 2025): 54
• Place of Birth: Pretoria, South Africa
• Key Ventures: Tesla (CEO), SpaceX (CEO/CTO), X (formerly Twitter, Owner/CTO), Neuralink (Co-founder), The Boring Company (Founder)
• Estimated Net Worth (2025): Varies, but consistently ranked as the world's richest person, with estimates ranging from $378 billion to over $500 billion, depending on the current valuation of his companies.
• Mothers of His Children: Justine Wilson, Grimes (Claire Boucher), Shivon Zilis, and Ashley St. Clair.

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

Elon Musk has often expressed concern over declining birth rates, stating that he is "doing his best to help the underpopulation crisis." This philosophy is reflected in the size of his family, which spans over two decades of fatherhood. The following is the definitive list of his 14 children, presented in chronological order by mother.

1. With Justine Wilson (6 Children)

Musk’s first wife, Canadian author Justine Wilson, is the mother of his first six children. They married in 2000 and divorced in 2008. Their journey into parenthood began with tragedy but was followed by a series of successful births via IVF.

• Nevada Alexander Musk (2002): Musk's first child, a son, tragically died of Sudden Infant Death Syndrome (SIDS) at just 10 weeks old.
• Griffin Musk (Born 2004): One of a pair of twin sons.
• Vivian Jenna Wilson (Born 2004): Griffin's twin. Vivian, who is transgender, legally changed her name in 2022, adopting her mother’s maiden name, Wilson, and stating she no longer wished to be related to her biological father.
• Kai Musk (Born 2006): One of a set of triplets.
• Saxon Musk (Born 2006): One of a set of triplets.
• Damian Musk (Born 2006): One of a set of triplets.

2. With Grimes (Claire Boucher) (3 Children)

Musician Grimes is known for her highly unconventional and technologically inspired names for their three children, who were born between 2020 and 2022. The names are a blend of mathematics, space, and elven language.

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• X Æ A-Xii Musk (Born May 2020): Originally named X Æ A-12, the name was legally changed due to California state laws prohibiting numbers in names. He is affectionately nicknamed "X."
• Exa Dark Sideræl Musk (Born December 2021): Known by the nickname "Y." This child was born via surrogate.
• Techno Mechanicus Musk (Born 2022): Known by the nickname "Tau," this son's existence was revealed in a 2023 biography of Musk.

3. With Shivon Zilis (4 Children)

Shivon Zilis, a top executive at Musk’s brain-chip company Neuralink, has four children with the billionaire. Their relationship is often noted for its professional context, as Zilis is a key figure in one of his core companies. The names of their children were revealed in a series of reports in 2024 and 2025.

• Strider Musk (Born November 2021): One of a pair of twins.
• Azure Musk (Born November 2021): Strider's twin sister.
• Arcadia Musk (Born February 2024): Their third child together, a daughter.
• Seldon Lycurgus Musk (Born 2024): Their fourth child, a son, whose full name was reported in late 2024.

4. With Ashley St. Clair (1 Child)

The most recent addition to the Musk family, confirmed in early 2025, is a son with conservative writer and media personality Ashley St. Clair.

• Romulus St. Clair (Born September 2024): His birth was announced by St. Clair in February 2025, with his name later revealed to be Romulus.

Decoding the Unconventional Names: Technology, Mythology, and the Unknown

The names chosen for Musk’s children with Grimes and the newest sons, Romulus and Seldon Lycurgus, are far from traditional. They serve as LSI keywords and key entities that provide deep insight into the family's unique naming conventions, which blend science fiction, classical history, and advanced technology.

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The Grimes Trio: X, Y, and Tau

The three children Musk shares with Grimes (Claire Boucher) have names that sound more like coding variables or scientific concepts than typical human names, showcasing the couple's shared interest in futurism and artificial intelligence.

• X Æ A-Xii ("X"): The name is a complex cipher. According to Grimes, "X" stands for "the unknown variable." "Æ" is the Elven spelling of AI (Artificial Intelligence or Love). "A-Xii" refers to the couple's favorite aircraft, the Lockheed A-12, a precursor to the SR-71 Blackbird, which is "great, no weapons, just speed."
• Exa Dark Sideræl ("Y"): This name is a nod to supercomputing and space. "Exa" refers to exaFLOPS, a unit of computing speed (a quintillion floating-point operations per second). "Dark" represents the unknown and dark matter. "Sideræl" is an Elven spelling of "sidereal," meaning relating to the distant stars.
• Techno Mechanicus ("Tau"): The name "Techno Mechanicus" is a clear reference to technology and machinery. His nickname, "Tau," is the 19th letter of the Greek alphabet, often used in mathematics and physics to represent time constants or torque, further cementing the scientific theme.

The Classical and Scientific References

Even the newer names reflect a deep dive into history and scientific literature, adding significant topical authority to the family's narrative:

• Romulus: The son with Ashley St. Clair is named after one of the legendary founders of Rome, Romulus, who, along with his twin brother Remus, is said to have established the Eternal City. This name connects the newest child to a grand, foundational historical narrative.
• Seldon Lycurgus: The fourth child with Shivon Zilis is named Seldon Lycurgus. "Seldon" is a likely reference to Hari Seldon, a fictional character from Isaac Asimov's *Foundation* series, a brilliant mathematician who invents psychohistory. "Lycurgus" is the legendary lawgiver of Sparta, suggesting a theme of structure, governance, and future planning.

The sheer number of children, coupled with their highly unusual names, makes Elon Musk’s family a unique case study in modern celebrity and the intersection of technology, ambition, and personal life. As his ventures continue to expand, his commitment to having a large family remains a consistent and defining feature of his public persona, embodying his stated mission to ensure the long-term survival and prosperity of the human species.