The Full List Of Elon Musk's 14 Children: Names, Mothers, And The Meaning Behind 'Techno Mechanicus' And 'Romulus'
The family tree of Elon Musk is one of the most dynamic and closely watched stories in the world, marked by a commitment to expanding the human population and a penchant for giving his children some of the most unique and complex names in modern history. As of late 2025, the Tesla and SpaceX CEO is the father of a reported 14 children, shared with four different women, a number that has grown significantly with multiple public announcements in early 2025.
This comprehensive guide provides the definitive, current list of all 14 children, their mothers, and the fascinating, often cryptic, inspirations behind their highly publicized monikers. The recent additions—including a fourth child with Shivon Zilis and a child with Ashley St. Clair—have cemented Musk’s status as a prolific father and a man who truly believes that "smart people should have more babies."
The Complete Biography and Lineage of Elon Musk's Children (Updated December 2025)
Elon Musk's family history begins with his first wife, Canadian author Justine Wilson, with whom he had six children. Following their divorce, he welcomed three children with musician Grimes (Claire Elise Boucher). Most recently, he has had four children with Neuralink executive Shivon Zilis and one child with conservative influencer Ashley St. Clair, bringing the total to 14 children.
- Mother: Justine Wilson (6 Children)
- Nevada Alexander Musk (Son): Born 2002. Tragically died of Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
- Griffin Musk (Son): Born 2004 (Twin).
- Vivian Jenna Wilson (Daughter): Born 2004 (Twin). She legally changed her name in 2022, dropping the Musk surname and adopting her mother's maiden name, stating she no longer wishes to be related to her biological father.
- Kai Musk (Son): Born 2006 (Triplet).
- Saxon Musk (Son): Born 2006 (Triplet).
- Damian Musk (Son): Born 2006 (Triplet).
- Mother: Grimes (Claire Elise Boucher) (3 Children)
- X Æ A-Xii (X) (Son): Born May 2020. Originally named X Æ A-12, the name was legally modified due to California state laws prohibiting numerals in names.
- Exa Dark Sideræl Musk (Y) (Daughter): Born via surrogate in December 2021. Her nickname is Y.
- Techno Mechanicus (Tau) (Son): Born in 2022. News of his birth was revealed in Walter Isaacson's 2023 biography of Musk. His nickname is Tau.
- Mother: Shivon Zilis (4 Children)
- Strider Musk (Son): Born November 2021 (Twin).
- Azure Musk (Daughter): Born November 2021 (Twin).
- Arcadia Musk (Daughter): Born 2024. The birth of this third child with Zilis was confirmed in early 2025.
- Seldon Lycurgus (Son): Born 2024. The birth of this fourth child with Zilis was announced in February 2025.
- Mother: Ashley St. Clair (1 Child)
- Romulus St. Clair (Son): Born September 2024. News of this child was announced in early 2025, with the name Romulus St. Clair being verified in April 2025.
Decoding the "Techno-Fantasy" Names: X, Y, and Tau
The names chosen by Elon Musk and Grimes are arguably the most famous and controversial in the entire lineage, pushing the boundaries of traditional naming conventions and reflecting the couple's shared interest in technology, space, and science fiction. These unique names are often seen as LSI keywords for the futuristic culture surrounding the billionaire.
X Æ A-Xii (X)
The first child of Musk and Grimes, X Æ A-Xii, was born in 2020 and quickly became a global phenomenon due to his name. The complex components break down into distinct meanings:
- X: Represents the unknown variable.
- Æ: The elven spelling of AI (artificial intelligence) or 'love.'
- A-Xii: Refers to the "Archangel-12," the internal name for the SR-71 Blackbird, the couple's favorite aircraft. The hyphen was added to comply with legal requirements.
Exa Dark Sideræl Musk (Y)
The couple’s second child, a daughter nicknamed Y, carries a name rooted in astrophysics and technology:
- Exa: A reference to ExaFLOPS, a unit of computing performance that represents one quintillion floating-point operations per second.
- Dark: A nod to "dark matter" or "the unknown dark," which makes up the vast majority of the universe.
- Sideræl: An elven spelling of 'sidereal,' meaning relating to or determined by the stars.
Techno Mechanicus (Tau)
The third child with Grimes, Techno Mechanicus, is perhaps the most direct reference to Musk’s domain. Born in 2022, his nickname is Tau, a Greek letter often used in mathematics and engineering. The full name itself is a clear blend of technology and classical terminology, further establishing the couple's unique naming tradition that blends the archaic with the futuristic.
The Greco-Roman and Sci-Fi Inspirations of the Newest Children
The names of the newest children, particularly those with Shivon Zilis and Ashley St. Clair, reveal a continued theme of drawing inspiration from classical history, mythology, and science fiction, adding a layer of topical authority to the billionaire's personal narrative. These unique names, which include Seldon Lycurgus and Romulus, are a testament to Musk's intellectual interests.
Seldon Lycurgus and Arcadia: The Foundation of Names
The four children with Shivon Zilis—Strider, Azure, Arcadia, and Seldon Lycurgus—all carry names with deep, meaningful roots. The newest additions, born in 2024, are especially notable:
- Seldon Lycurgus: This name is a dual reference to two historical and literary giants. Seldon is believed to be inspired by Hari Seldon, the fictional mathematician from Isaac Asimov’s seminal *Foundation* science fiction series. Lycurgus refers to the legendary lawgiver of Sparta, known for establishing its military-focused society. This choice strongly reflects Musk's interest in foundational governance and long-term civilization planning.
- Arcadia: The name of the third child with Zilis, Arcadia, is a classical Greek term referring to a vision of pastoral harmony and natural paradise, contrasting the hyper-technical nature of the other names.
- Strider and Azure: The 2021 twins also follow a thematic pattern. Strider suggests movement, exploration, and a traveler (a possible nod to Aragorn's nickname in *The Lord of the Rings*), while Azure refers to the deep blue color of the sky, often associated with space and the cosmos.
Romulus: The Founding Father
The most recent publicly confirmed child, Romulus St. Clair, born to Ashley St. Clair, continues the classical theme. Romulus is the legendary founder and first king of Rome, who, with his twin brother Remus, was raised by a she-wolf. The name is a direct and powerful nod to the foundation of a civilization, a concept central to Musk’s long-term vision for humanity, including the colonization of Mars. The name was verified in April 2025, making it one of the freshest details in the Musk family saga.
The Growing Musk Lineage and Public Interest
The revelation of 14 children with four different partners, including the newest additions Arcadia, Seldon Lycurgus, and Romulus, has generated immense public curiosity and media coverage in 2025. The names themselves are not merely eccentric choices; they function as a personal lexicon, a reflection of Elon Musk's core fascinations: technology, space exploration, classical history, and the future of human civilization.
Whether the names are a form of performance art or a deeply personal tribute to his intellectual heroes, they ensure that the next generation of the Musk family will carry a lineage as unique as the man himself. The ongoing story of the Musk-eteers, as some media outlets have dubbed them, continues to be a compelling blend of high-tech futurism and ancient historical references.
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