The Full List Of Elon Musk’s 9 Sons: Names, Ages, And The Shocking Meaning Behind 'Techno Mechanicus' (Updated 2025)

Elon Musk, the prolific CEO of Tesla and SpaceX, is known globally for his ambitious ventures into space exploration and electric vehicles, but his most discussed project may be his rapidly expanding family. As of late 2025, the billionaire is the father of 14 children with four different women, and the names he chooses for his sons are arguably the most unique in the public eye, blending classical, technological, and even elven influences. This article provides the definitive, up-to-date list of all nine of his sons, their mothers, and the fascinating stories behind their unconventional names. The most recent update to the Musk family tree confirms the birth of his 14th child, a son named Romulus, with author Ashley St. Clair, revealed in early December 2025. This latest addition solidifies the complex and fascinating structure of the Musk family, which includes three sets of twins/triplets, a tragic loss, and a legal name change. The curiosity surrounding names like X Æ A-Xii and Techno Mechanicus continues to drive global fascination with the tech mogul's personal life and his vision for the future, which he clearly expresses through his children's identities.

Elon Reeve Musk: A Comprehensive Biographical Profile

As the patriarch of this unconventional family, Elon Musk’s own background is as complex and high-achieving as his children's names. Born in South Africa, his relentless drive has led him to the pinnacle of the global business world.

• Full Name: Elon Reeve Musk
• Date of Birth: June 28, 1971
• Place of Birth: Pretoria, South Africa
• Parents: Errol Musk (Father, engineer/businessman) and Maye Musk (Mother, model and dietitian)
• Siblings: Kimbal Musk (Brother) and Tosca Musk (Sister)
• Key Companies: Tesla (CEO), SpaceX (CEO & CTO), X (formerly Twitter, Executive Chairman & CTO), Neuralink, The Boring Company, xAI
• Estimated Net Worth (2025): Varies, but consistently ranked as the world's richest person, with estimates reaching over $600 billion, driven by the success of Tesla and SpaceX.

The Nine Sons of Elon Musk: A Chronological List

Elon Musk has welcomed nine sons over two decades with three different partners. His children's names are a striking blend of traditional and futuristic, reflecting his fascination with technology, science fiction, and space. The list below is organized chronologically by birth.

1. Nevada Alexander Musk (Deceased)

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Nevada Alexander Musk was the first child of Elon Musk and his first wife, Canadian author Justine Musk. Born in 2002, he tragically passed away from Sudden Infant Death Syndrome (SIDS) at just ten weeks old. The profound loss spurred the couple to pursue IVF for their subsequent children.

2. Griffin Musk & 3. Xavier Musk (Now Vivian Jenna Wilson) - Twins

Born in 2004 via IVF, Griffin and his twin, formerly named Xavier Musk, were the first surviving children of Elon and Justine Musk. Griffin Musk is one of the more conventionally named sons in the family. His twin, however, legally changed her name to Vivian Jenna Wilson in 2022, adopting her mother's maiden name, and identifying as a female. This makes Griffin the eldest surviving son.

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4. Kai Musk, 5. Saxon Musk, & 6. Damian Musk - Triplets

In 2006, Elon and Justine Musk welcomed triplets Kai, Saxon, and Damian, also conceived via IVF. These three sons complete the set of five surviving children from Musk's first marriage. The names Kai and Damian are of Greek and Latin origin, respectively, while Saxon is a historical Germanic name, showing a mix of classic influences.

7. X Æ A-Xii Musk (Nickname: X)

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Born in May 2020, X Æ A-Xii is the first son of Elon Musk and musician Grimes (Claire Boucher). Originally named X Æ A-12, the name was legally changed to comply with California law, which prohibits numbers in a name. The name is a complex cipher:

• X: The unknown variable.
• Æ: The elven spelling of "Ai" (love and/or Artificial Intelligence).
• A-Xii: A reference to the Lockheed SR-71 Blackbird's predecessor, the Archangel 12.

He is most often referred to by his nickname, "X."

8. Techno Mechanicus Musk (Nickname: Tau)

Techno Mechanicus, nicknamed "Tau," is the third child of Elon Musk and Grimes, born in June 2022. His existence was revealed in Walter Isaacson's 2023 biography of Musk. The name is perhaps the most overtly technical and futuristic of all his children.

• Techno Mechanicus: Directly translates to "Master of Machines" or "Mechanical Technology," reflecting Musk's core business interests.
• Tau: The nickname is a letter in the Greek alphabet, often used in physics and mathematics, further cementing the scientific theme.

This son’s unique name has generated significant public fascination due to its direct ties to science and engineering.

9. Strider Zilis Musk & 10. Romulus Musk

Musk’s two most recently confirmed sons were born in late 2021 and 2024, respectively, with two different mothers, further expanding his large family.

• Strider Zilis Musk: Strider is one half of a set of twins born in November 2021 to Neuralink executive Shivon Zilis. Strider and his twin sister, Azure Zilis Musk, use their mother’s surname as a middle name.
• Romulus Musk: The most recently revealed son, Romulus, was born to author Ashley St. Clair in late 2024, with the name confirmed in early 2025. Romulus is a Latin name of great historical significance, referencing one of the legendary founders of Rome, contrasting sharply with the highly technical names of his half-brothers.

The Mothers Behind The Musk Children

The nine sons and five daughters of Elon Musk were born to four different women, each a successful figure in her own right. The co-parenting dynamic of this large, distributed family is as much a topic of discussion as the unique names themselves.

Justine Musk (Jennifer Wilson)

Justine Musk, a Canadian author, was Elon Musk’s first wife. She is the mother of his first six children: Nevada Alexander, twins Griffin and Vivian (formerly Xavier), and triplets Kai, Saxon, and Damian. Their children were all conceived through in vitro fertilization (IVF) following the tragic loss of Nevada.

Grimes (Claire Boucher)

The Canadian musician and artist Grimes is the mother of three of Musk’s children, two of whom are sons: X Æ A-Xii and Techno Mechanicus (Tau). Their third child is a daughter, Exa Dark Sideræl Musk (nickname "Y"). Grimes has publicly discussed the unique, futuristic, and sometimes chaotic inspiration behind their children’s names, tying them to concepts like exaFLOPS, dark matter, and supercomputing.

Shivon Zilis

Shivon Zilis, a high-ranking executive at Musk's company Neuralink, is the mother of a set of twins, Strider Zilis Musk (son) and Azure Zilis Musk (daughter), born in November 2021. The twins’ births were kept private until court filings were made public in 2022.

Ashley St. Clair

Ashley St. Clair, an author and media personality, is the mother of the newest addition to the Musk family, son Romulus Musk, whose birth was confirmed in early 2025. This latest revelation brings the total count of Musk’s children to 14.

The Topical Authority: Why The Names Matter

The names of Elon Musk’s sons are more than just eccentric choices; they are entities that reflect his worldview and the technological entities he champions. The naming conventions—from the classical Griffin, Kai, Saxon, and Damian to the hyper-futuristic X Æ A-Xii and Techno Mechanicus—mirror the duality of his business empire, which spans the established automotive industry (Tesla) and the frontier of space exploration (SpaceX). The adoption of a name like Romulus also suggests a nod to the building of new empires, a theme consistent with his goals for colonizing Mars. The names serve as a tangible link between his personal life and his public persona as a visionary obsessed with the future of humanity, artificial intelligence, and supercomputing.