The Musk Dynasty: All 14 Children's Names, Their Mothers, And The Meaning Behind X, Y, Tau, And Romulus

The question of "How many children does Elon Musk have?" has become one of the most frequently searched queries on the internet, and the answer is constantly changing. As of late 2024 and early 2025, the tech billionaire's family tree has expanded to a staggering 14 children, shared with four different partners, creating one of the most unconventional and high-profile modern dynasties. This comprehensive guide breaks down the full, updated list of names, the mothers, and the fascinating, often futuristic, meaning behind each unique moniker. The recent revelations of new children, including the confirmed existence of a fourth child with Neuralink executive Shivon Zilis and the public naming of his child with conservative influencer Ashley St. Clair, have brought the total count to a record-breaking 14. From classical Roman figures to obscure supercomputing terms, the names chosen by the Tesla and SpaceX CEO reflect his unique worldview, blending ancient history with a futuristic, sci-fi sensibility.

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

The Musk family is a complex tapestry woven across two decades and four partners. The children's names range from traditional to the highly complex, with birth years spanning from the early 2000s to late 2024. This is the definitive chronological list of all 14 children and their respective mothers, providing the essential context for the ever-growing Musk legacy.

• Nevada Alexander Musk (with Justine Wilson)
  • Born: 2002
  • Status: Tragically died of Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
• Griffin Musk & Vivian Jenna Wilson (Twins with Justine Wilson)
  • Born: 2004
  • Note: Vivian legally changed her name and gender in 2024, choosing to take her mother's maiden name.
• Kai Musk, Saxon Musk, & Damian Musk (Triplets with Justine Wilson)
  • Born: 2006
  • Note: The triplets were conceived via IVF following the loss of Nevada.
• Strider Musk & Azure Musk (Twins with Shivon Zilis)
  • Born: Late 2021/Early 2022
  • Note: Shivon Zilis is a high-ranking executive at Neuralink, one of Musk’s companies. The twins’ names were kept private until court documents were revealed.
• X Æ A-Xii Musk (Nickname: X) (with Grimes, born Claire Boucher)
  • Born: May 4, 2020
  • Note: Originally named X Æ A-12, the name was legally modified to comply with California law, which prohibits numbers in a name.
• Exa Dark Sideræl Musk (Nickname: Y) (with Grimes, born Claire Boucher)
  • Born: December 2021 (via surrogate)
  • Note: Her full name and existence were kept private until a 2022 profile in a magazine.
• Techno Mechanicus Musk (Nickname: Tau) (with Grimes, born Claire Boucher)
  • Born: 2022
  • Note: His name was revealed in Walter Isaacson’s 2023 biography of Elon Musk.
• Arcadia Musk & Seldon Lycurgus Musk (Twins with Shivon Zilis)
  • Born: 2024 (exact date undisclosed)
  • Note: The existence of a second set of twins/children with Zilis was a recent revelation in early 2025, bringing Zilis’s total to four children with Musk.
• Romulus St. Clair (with Ashley St. Clair)
  • Born: September 2024
  • Note: The name was publicly revealed by the mother, conservative influencer Ashley St. Clair, in early 2025.

The Cryptic Code: Decoding the Futuristic Names of X, Y, and Tau

The children Elon Musk shares with musician Grimes (Claire Boucher) are arguably the most famous for their unconventional, almost coded names. These monikers are not random; they are deeply rooted in mathematics, aerospace, and science fiction, demonstrating a clear intention to look toward a technological future.

X Æ A-Xii Musk (X)

The first child to break the traditional naming mold was X Æ A-12, later legally changed to X Æ A-Xii. The name is a direct nod to Musk's passion for aviation and his partner's artistic sensibility. * X: Represents the "unknown variable," a classic mathematical symbol. * Æ: According to Grimes, this is the "elven spelling" of 'Ai,' which translates to either "love" or "artificial intelligence." * A-Xii: This is a reference to the Lockheed SR-71 Blackbird's internal name, the "Archangel-12" or A-12. It is described as the couple’s favorite aircraft, known for its speed and lack of weapons. The name itself is a blend of technology, mystery, and a vision of the future.

Exa Dark Sideræl Musk (Y)

The second child with Grimes, nicknamed "Y" to follow "X," has an equally profound and complex name: Exa Dark Sideræl. The full name is a deep dive into the language of supercomputing and astrophysics. * Exa: This is a direct reference to *exaFLOPS*, a supercomputing term for the ability to perform one quintillion floating-point operations per second. It speaks to the cutting edge of computational power. * Dark: This part of the name refers to "the unknown" and specifically to *dark matter*, the mysterious, non-luminous substance that makes up the vast majority of the universe's mass. * Sideræl: Pronounced "sigh-deer-ee-elle," this term is a variation of *sidereal*, which means "with respect to the distant stars." It connects the child to the cosmos and the grand scale of space exploration, a core theme in Musk’s life.

Techno Mechanicus Musk (Tau)

The third child with Grimes, revealed in the Musk biography, is named Techno Mechanicus, with the nickname "Tau." This name continues the theme of mathematical and technological references. * Tau: The nickname is a Greek letter that is a mathematical constant, associated with 2π. It has become a symbol in some mathematical circles to replace Pi (π) as a more fundamental constant. * Techno Mechanicus: This is a clear and direct reference to technology and mechanics, reinforcing the family's deep ties to engineering, innovation, and futuristic concepts.

From Roman Founders to Neuralink Executives: The Expanding Family Circle

The latest additions to the Musk family highlight the ongoing growth of his unconventional family structure, involving a total of four mothers. The names chosen for these children offer a contrast to the sci-fi monikers, often leaning into classical or more traditional themes.

The Zilis Children: Strider, Azure, Arcadia, and Seldon

The four children Musk shares with Neuralink executive Shivon Zilis—Strider, Azure, Arcadia, and Seldon Lycurgus—represent a significant expansion of the family that was largely kept out of the public eye until recent reports. The names *Strider* and *Azure* are evocative and slightly nature-themed, while *Arcadia* is a classical name referring to a region of Greece associated with pastoral innocence and harmony. The name *Seldon Lycurgus* is particularly intriguing, as *Lycurgus* is the name of the legendary lawgiver of Sparta, suggesting a nod to classical history and governance, a theme that mirrors the newest addition.

The Newest Revelation: Romulus St. Clair

The most recent and highly publicized addition is Romulus St. Clair, born to conservative influencer Ashley St. Clair in September 2024. The name *Romulus* is instantly recognizable as the legendary founder of Rome, who, along with his twin brother Remus, was said to have been raised by a she-wolf. The choice of a name with such strong historical and foundational significance is a powerful statement. The public revelation of this child's name and existence, amidst a reported "dramatic paternity dispute," has added another layer of complexity to the already fascinating narrative of the Musk family. The story of Elon Musk's children is more than a list of names; it is a reflection of his personal philosophy, his obsession with science and technology, and his unconventional approach to building a legacy. With 14 children spanning four partners, the Musk dynasty is a unique and continually evolving entity in the world of global billionaires.