The Definitive List Of All 14 Elon Musk Children: Names, Mothers, And The Shocking Meanings Behind 'X,' 'Y,' And 'Tau' (2025 Update)

As of late 2025, Elon Musk is the father of 14 children, an expanding family that has become as newsworthy as his ventures into space exploration and electric vehicles. This number reflects a significant increase in recent years, driven by Musk's outspoken public stance on the global "fertility crisis" and his belief that declining birth rates pose one of the biggest risks to civilization. This comprehensive list details every child, from his first son born in 2002 to the newest additions announced in early 2025, including the highly unusual, futuristic names that have captured global curiosity. The names of Elon Musk's children are a fascinating study in contrast, ranging from classical to mythological, and from conventional to the utterly unique, like X Æ A-Xii and Exa Dark Sideræl. The billionaire's personal life remains under intense scrutiny, with the identity of all 14 "Musk-eteers" and the mothers who share them being a constant source of public fascination. This list provides the most current, verified details on the Musk family tree.

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

The Tesla and SpaceX CEO has welcomed 14 children with four different partners. This section provides a chronological breakdown of his children, their names, and their mothers, reflecting the latest public announcements as of December 2025.

• Nevada Alexander Musk (Deceased)
• Mother: Justine Wilson (Canadian Author)
• Born: 2002
• Note: Nevada tragically died of SIDS (Sudden Infant Death Syndrome) at 10 weeks old.
• Griffin Musk (Twin)
• Mother: Justine Wilson
• Born: 2004
• Vivian Jenna Wilson (Twin, formerly Xavier Musk)
• Mother: Justine Wilson
• Born: 2004
• Note: Legally changed her name in 2022 to officially distance herself from her father.
• Kai Musk (Triplet)
• Mother: Justine Wilson
• Born: 2006
• Saxon Musk (Triplet)
• Mother: Justine Wilson
• Born: 2006
• Damian Musk (Triplet)
• Mother: Justine Wilson
• Born: 2006
• X Æ A-Xii Musk ('X')
• Mother: Grimes (Claire Boucher, Musician)
• Born: May 2020
• Note: Originally named X Æ A-12, the name was legally changed due to California law restrictions.
• Strider Musk (Twin)
• Mother: Shivon Zilis (Neuralink Executive)
• Born: November 2021 (via IVF)
• Azure Musk (Twin)
• Mother: Shivon Zilis
• Born: November 2021 (via IVF)
• Exa Dark Sideræl Musk ('Y')
• Mother: Grimes
• Born: December 2021 (via surrogate)
• Techno Mechanicus Musk ('Tau')
• Mother: Grimes
• Born: 2023
• Arcadia Musk
• Mother: Shivon Zilis
• Born: 2024
• Romulus St. Clair
• Mother: Ashley St. Clair (Conservative Influencer)
• Born: September 2024 (Name revealed February 2025)
• Note: The baby's name was revealed in early 2025, confirming the new addition to the family.
• Seldon Lycurgus Musk
• Mother: Shivon Zilis
• Born: Late 2024 (Announced February 2025)
• Note: The fourth child with Zilis, making him the 14th child overall.

Decoding the Futuristic and Mythological Names

While the children with Justine Wilson bear relatively traditional names (Griffin, Kai, Saxon, Damian), the children shared with Grimes and the newest additions with Shivon Zilis and Ashley St. Clair introduce a new level of complexity and curiosity. These names are not merely eccentric; they are deeply rooted in science, mythology, and futurism, reflecting the worldview of their parents.

The Grimes Trilogy: X, Y, and Tau

The names of the three children Elon Musk shares with musician Grimes (Claire Boucher) are arguably the most famous and complex, often sounding more like coding variables or spacecraft designations than traditional human names. * X Æ A-Xii ('X'): The original name, X Æ A-12, had to be changed because California law prohibits the use of numbers in a legal name. The current name, X Æ A-Xii, is pronounced "Ex Ash A Twelve." According to Grimes, the 'X' stands for "the unknown variable," 'Æ' is the Elven spelling of 'AI' (artificial intelligence and/or love), and 'A-Xii' is a nod to the Archangel-12, the original internal name for the SR-71 Blackbird aircraft, which they call "their favorite aircraft." * Exa Dark Sideræl ('Y'): Born in late 2021, the daughter's name is a blend of supercomputing and cosmology. 'Exa' refers to ExaFLOPS, a term used in supercomputing, while 'Dark' represents the unknown, specifically dark matter. 'Sideræl' is a "more elven spelling" of sidereal, meaning relating to the stars. The nickname 'Y' naturally follows 'X'. * Techno Mechanicus ('Tau'): The third child's name, nicknamed 'Tau,' is a clear reference to technology and engineering, aligning perfectly with Musk's professional empire. 'Tau' is also the 19th letter of the Greek alphabet, often used in physics and mathematics.

Classical and Scientific Influence in the Newest Names

The newest additions continue the trend of names with deep, often classical or scientific, roots, particularly the children shared with Shivon Zilis. * Seldon Lycurgus Musk: The 14th child, Seldon, is believed to be a reference to Hari Seldon, a fictional character from Isaac Asimov's seminal *Foundation* science fiction series. Lycurgus refers to the legendary lawgiver of Sparta, suggesting a nod to ancient political philosophy and order. * Romulus St. Clair: The son of Ashley St. Clair, Romulus is a name drawn directly from Roman mythology. In legend, Romulus and his twin brother Remus were the founders of Rome, reinforcing the theme of classical power and origin.

The Context: Pronatalism and The Global Fertility Crisis

The rapid expansion of Elon Musk's family is not just a personal matter; it is intrinsically linked to his public philosophy on global demographics. Musk is a fervent proponent of "pronatalism," the belief that a society should encourage reproduction. He has repeatedly warned that declining birth rates—not "overpopulation"—pose an existential threat to human civilization. He has stated that "overpopulation is the most nihilistic lie ever told" and champions the idea that smart people should have more children to help reverse the global fertility collapse. His own large family is often cited as a practical demonstration of his conviction, transforming his personal life into a highly public statement about the future of humanity. This belief system provides a profound context for the family's growth, suggesting that the children are not just heirs to a vast fortune but are, in Musk's view, active participants in a civilizational imperative. The names themselves—steeped in science, technology, and classical philosophy—reinforce this narrative, positioning his offspring as a new generation destined to shape the future he envisions.