The Definitive List: All 14 Of Elon Musk's Children, Their Mothers, And Their Unconventional Names (2025 Update)

Elon Musk's family tree is as complex and rapidly expanding as his business empire of SpaceX, Tesla, and X. As of early 2025, the tech billionaire is the father of 14 children, a number that has recently grown following the announcement of two new additions born in 2024.

This extensive lineage, which spans four different mothers, is a topic of intense public curiosity and media coverage, largely due to the unconventional names chosen for his younger children and the high-profile nature of their mothers. This article provides the definitive, chronological, and up-to-date list of all his children, their mothers, and the circumstances surrounding their births.

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

Elon Musk's journey into fatherhood began in the early 2000s and has continued through the present day, with his children ranging from their early twenties to infants. The mothers of his children are his first wife, Canadian author Justine Wilson; musician Grimes (born Claire Boucher); Neuralink executive Shivon Zilis; and conservative author Ashley St. Clair.

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Children with Justine Wilson (6 Children)

Elon Musk and his first wife, Justine Wilson, met in college and married in 2000. They had six children together, though their firstborn tragically passed away. All five surviving children were conceived via In Vitro Fertilization (IVF).

• Nevada Alexander Musk (Born: 2002; Deceased: 2002). Nevada was the couple's first son, who tragically died of Sudden Infant Death Syndrome (SIDS) at just 10 weeks old.
• Griffin Musk (Born: 2004). Griffin is one of the couple's twin sons.
• Vivian Jenna Wilson (formerly Xavier Musk) (Born: 2004). Vivian is Griffin's twin. In 2022, she legally changed her name to Vivian Jenna Wilson, adopting her mother's maiden name, and filed a petition to officially recognize her gender identity.
• Kai Musk (Born: 2006). Kai is one of the couple's triplet sons.
• Saxon Musk (Born: 2006). Saxon is the second of the triplets.
• Damian Musk (Born: 2006). Damian is the third of the triplets.

Children with Grimes (3 Children)

Musk’s relationship with Canadian musician Grimes, which began in 2018, is known for producing some of the most unique and talked-about celebrity baby names in modern history.

• X Æ A-12 Musk (X) (Born: May 2020). Originally named X Æ A-12, the name was later legally changed to X Æ A-Xii due to California state law prohibiting numbers in a name. He is most commonly referred to as "X."
• Exa Dark Sideræl Musk (Y) (Born: December 2021). Exa Dark Sideræl was welcomed via surrogate. Grimes and Musk nicknamed her "Y."
• Techno Mechanicus (Tau) (Born: 2022/2023). The existence of their third child, nicknamed Tau, was revealed in Walter Isaacson's 2023 biography of Elon Musk. His full name is reported as Techno Mechanicus Musk.

Children with Shivon Zilis (4 Children)

Shivon Zilis, a top executive at Musk's Neuralink company, has quietly welcomed four children with the billionaire. The relationship and the births of the first set of twins were initially kept private, only becoming public knowledge through court documents in 2022.

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• Strider Zilis Musk (Born: November 2021). Strider is one of the boy-girl twins born just weeks before the arrival of Grimes' daughter, Exa Dark Sideræl.
• Azure Zilis Musk (Born: November 2021). Azure is the second of the twins. The twins use their mother's surname, Zilis, as a middle name.
• Arcadia Musk (Born: 2024). Arcadia is the third child born to Musk and Zilis.
• Seldon Lycurgus Musk (Born: 2024). Seldon is the fourth child with Zilis, whose birth was reported in 2024, adding to the rapid expansion of the Musk family.

Child with Ashley St. Clair (1 Child)

The latest addition to the Musk family was announced in early 2025, confirming a 14th child with conservative author and influencer Ashley St. Clair.

• Romulus St. Clair (Born: September 2024). The child's name, Romulus, was revealed in reports following the public announcement in February 2025. Romulus is a Latin name, continuing the trend of classical or futuristic names in the Musk family.

The Philosophy Behind the Unconventional Naming Choices

The names of Elon Musk's children, particularly those with Grimes, have fueled endless debate and speculation about the billionaire's worldview and his fascination with technology, science fiction, and classical history.

The most famous example is X Æ A-Xii, a name that Grimes has explained is a combination of an unknown variable (X), the Elven spelling of AI (Artificial Intelligence) or love (Æ), and the name of the couple's favorite aircraft (A-12).

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This naming convention is a clear reflection of Musk's core interests: the future of humanity, space exploration, and advanced technology. The names are not merely eccentric; they are symbolic representations of a technological and mythological worldview.

The name Exa Dark Sideræl is equally complex. 'Exa' refers to ExaFLOPS, a unit of computing performance. 'Dark' is meant to represent "the unknown," and 'Sideræl' is a more Elven spelling of sidereal, meaning related to the stars or constellations. Finally, Techno Mechanicus (Tau) speaks for itself, blending technology with a classic, almost philosophical, title.

Even the latest additions, Seldon Lycurgus and Romulus, draw on deep historical and literary roots. Hari Seldon is a central character in Isaac Asimov's *Foundation* series, a work of science fiction that Musk greatly admires. Lycurgus was a legendary lawgiver of Sparta, and Romulus was one of the mythical founders of Rome, names that suggest ambition, leadership, and the building of new civilizations—themes central to Musk's public persona.

The Evolving Public Life of the Musk Children

While the younger children remain largely out of the public eye, the older children have begun to make their own headlines, reflecting the diverse and sometimes complicated nature of the Musk family dynamic.

The most notable development was the legal transition of Vivian Jenna Wilson. Her decision to change her name and sever her relationship with her father was a significant public event, highlighting the personal complexities that can exist within a high-profile family.

Meanwhile, the children of Shivon Zilis are often at the center of discussions about Neuralink and the future of artificial intelligence. Zilis, a key figure in the company, shares Musk's vision of addressing the "underpopulation crisis," a philosophy that Musk has often cited as a driving force behind his large family.

The children with Justine Wilson are now young adults, navigating the world with one of the most famous and wealthy fathers on the planet. Their lives, though generally private, offer a glimpse into the upbringing within the initial Musk family structure before the rise of Tesla and SpaceX to their current global dominance.

The constant, and sometimes controversial, growth of the Musk family, with the newest additions Arcadia, Seldon Lycurgus, and Romulus, ensures that the public fascination with the "Musk-eteers" will continue for years to come. Their names, their mothers, and their unique place in the world make them one of the most intriguing "billionaire families" of the 21st century.