The Full List Of Elon Musk's 15 Children: Names, Mothers, And Shocking New Details In 2025

The family tree of Elon Musk, the world's most prolific tech billionaire, is one of the most talked-about and rapidly expanding legacies in modern history. As of late 2024 and early 2025, the total number of children fathered by the CEO of Tesla, SpaceX, and X (formerly Twitter) stands at 15, with 14 currently living. This extensive and unconventional family—often referred to as the 'Musk-eteers'—spans two decades and includes children from four different mothers, each with a unique story, from futuristic names to major personal and legal developments.

This article provides the most current and comprehensive breakdown of every child, including the latest news on Romulus St. Clair and the details of Vivian Jenna Wilson's legal name change. The sheer size and complexity of the Musk family continue to capture global curiosity, reflecting the billionaire’s stated philosophy on the importance of population growth and his desire to pass on his genes.

The Complete Chronological Biography of Elon Musk's Children (Updated for 2025)

Elon Musk has fathered 15 children with four different women: Canadian author Justine Wilson (now Justine Musk), musician Grimes (Claire Boucher), Neuralink executive Shivon Zilis, and influencer Ashley St. Clair. The children's ages range from a few months old to 20 years old, with their lives often kept private, though certain details have made major headlines.

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With Justine Musk (5 Living Children, 1 Deceased)

• Nevada Alexander Musk (Deceased): Born May 2002. Nevada tragically died of Sudden Infant Death Syndrome (SIDS) at just 10 weeks old.
• Vivian Jenna Wilson (formerly Xavier Musk): Born April 2004 (Twin). Vivian is one half of a set of twins and legally changed her name in 2022.
• Griffin Musk: Born April 2004 (Twin). Griffin is the other half of the twins, born via IVF.
• Kai Musk: Born 2006 (Triplet). Kai is one of the triplets, born via IVF.
• Saxon Musk: Born 2006 (Triplet). Saxon is the second of the triplets.
• Damian Musk: Born 2006 (Triplet). Damian is the third of the triplets.

With Grimes (Claire Boucher) (3 Living Children)

• X Æ A-Xii Musk ('X'): Born May 2020. Known for his unusual, futuristic name.
• Exa Dark Sideræl Musk ('Y'): Born December 2021. Born via surrogate, her existence was revealed in a 2022 interview.
• Techno Mechanicus Musk ('Tau'): Born June 2022. The third child with Grimes, whose birth was kept private for over a year.

With Shivon Zilis (4 Living Children)

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• Strider Musk: Born November 2021 (Twin). One of the twins born quietly just weeks before Exa Dark Sideræl's birth.
• Azure Musk: Born November 2021 (Twin). The other half of the twins with Zilis.
• Arcadia Musk: Born February 2024. The third child with Zilis, whose birth was confirmed in 2024.
• Seldon Lycurgus Musk: Born Late 2024. The fourth child with Zilis, confirming Musk's 14th known child.

With Ashley St. Clair (1 Living Child)

• Romulus St. Clair: Born September 2024. Paternity was publicly acknowledged in early 2025, making him Musk's 15th known child.

The Truth Behind Vivian Jenna Wilson's Name Change and Public Stance

One of the most significant and public developments in the Musk family came with the legal transition and name change of one of his eldest children. Born Xavier Alexander Musk, the child filed a petition in Los Angeles County Superior Court in 2022 to legally change her name to Vivian Jenna Wilson.

A Clear Break from the Musk Surname

The name change was not simply about gender identity; it was a clear statement of separation. The court documents, which became public, listed the reason for the change as: "Gender Identity and the fact that I no longer live with or wish to be related to my biological father in any way, shape or form." By adopting her mother Justine Musk's maiden name, Wilson, Vivian made a definitive move to distance herself from the Musk name and legacy.

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Vivian Jenna Wilson has since made a few public appearances, including debuting at New York Fashion Week, and has maintained a low profile outside of her legal filings. The public nature of her statement highlighted the personal friction within the family, a rare glimpse into the private life of the tech mogul's children.

The Futuristic Names of the 'X, Y, and Tau' Trio

The children Elon Musk shares with musician Grimes are globally famous for their highly technical and unusual names: X Æ A-Xii, Exa Dark Sideræl, and Techno Mechanicus. These names reflect the parents' shared interests in space, technology, and esoteric language, providing a fascinating topical authority for the future of naming conventions.

X Æ A-Xii ('X'): The Archangel and AI

Born in 2020, X Æ A-Xii, or 'X' for short, was the first child of Musk and Grimes. The name's components were explained by Grimes as having specific, deep meanings:

• X: Represents "the unknown variable."
• Æ: An "elven spelling" of AI (Artificial Intelligence) or the word "love" in some languages.
• A-Xii: A reference to the Lockheed SR-71 Blackbird's predecessor, the Archangel-12, which the couple considers the "coolest aircraft ever."

Exa Dark Sideræl ('Y'): Supercomputing and Dark Matter

The second child with Grimes, Exa Dark Sideræl Musk, or 'Y', was born via surrogate in December 2021. Her name is equally complex and science-focused:

• Exa: A reference to exaFLOP, a term used in supercomputing, specifically a measure of a computer's speed.
• Dark: Represents "dark matter," the unseen, unknown element of the universe.
• Sideræl: An elven spelling of "sidereal," which refers to the true time of the universe, based on distant stars, not the sun.

Techno Mechanicus ('Tau'): Music and Machinery

The third child with Grimes, Techno Mechanicus, nicknamed 'Tau' (the Greek letter for $\tau$), was born in June 2022. His existence was only revealed in late 2023. While the parents have offered fewer public explanations for this name, the components suggest:

• Techno: Likely a nod to the electronic music genre, reflecting Grimes' career.
• Mechanicus: A Latin-sounding term related to machines, mechanics, or the mechanical nature of the universe, fitting the family's sci-fi aesthetic.

The Newest Additions: Seldon Lycurgus and Romulus St. Clair

The period from late 2024 to early 2025 brought two new, highly publicised additions to the Musk family, cementing the billionaire's status as a father of 15 children.

Seldon Lycurgus Musk: The Fourth with Shivon Zilis

In late 2024, it was confirmed that Musk and Neuralink executive Shivon Zilis had welcomed their fourth child together, a son named Seldon Lycurgus Musk. This news came shortly after the confirmation of their third child, Arcadia, born earlier in 2024. Zilis, who is a director at Neuralink, is now the mother of four of Musk's children, including the twins Strider and Azure. The name "Seldon" may be a reference to Hari Seldon, a fictional character in Isaac Asimov's Foundation series, a known favourite of Musk's.

Romulus St. Clair: The 15th Child

The most recent and unexpected revelation came in early 2025 when conservative influencer and journalist Ashley St. Clair publicly announced that Musk was the father of her son, Romulus St. Clair, born in September 2024. The news, which included details of a paternity dispute and court filings, made major headlines. The name Romulus is famously one half of the legendary twin founders of Rome, Romulus and Remus.

The continuous expansion of the Musk family, with 15 children from four mothers, ensures that the topic remains one of the most compelling and constantly updated stories in the world of tech and celebrity.