The Definitive List Of Elon Musk's Sons' Names: Meanings, Mothers, And The Latest 2025 Additions

As of December 10, 2025, Elon Musk is a father to 14 children, and the names of his sons continue to be a source of global fascination, blending ancient history, science fiction, and complex mathematics. The latest updates in 2025 have confirmed two new sons, *Romulus* and *Seldon Lycurgus*, solidifying Musk's reputation for choosing monikers that are anything but ordinary. This in-depth article provides the definitive, up-to-date list of all of Elon Musk's sons, revealing the mothers and the often-bizarre meanings behind their one-of-a-kind names. The Tesla and SpaceX CEO’s family life is as prolific and unconventional as his business ventures, with his children’s names often serving as cryptic nods to his intellectual interests. From triplets born two decades ago to the most recent additions with unique, historically-inspired names, the complete list of his male offspring is a testament to his unique worldview.

Elon Musk's Sons: A Complete Chronological Biography

The following list details all of Elon Musk's sons in chronological order, including their mother, birth year, and any notable facts or name changes. This information is current as of the latest 2025 reports.

• Nevada Alexander Musk (Deceased)
  • Mother: Justine Wilson
  • Born: 2002
  • Note: Tragically died of Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
• Griffin Musk (Twin)
  • Mother: Justine Wilson
  • Born: 2004 (via IVF)
  • Note: Twin with daughter Vivian Jenna Wilson (who legally changed her name and gender in 2022).
• Kai Musk (Triplet)
  • Mother: Justine Wilson
  • Born: 2006 (via IVF)
  • Note: Triplet with his brothers Saxon and Damian.
• Saxon Musk (Triplet)
  • Mother: Justine Wilson
  • Born: 2006 (via IVF)
  • Note: Triplet with his brothers Kai and Damian.
• Damian Musk (Triplet)
  • Mother: Justine Wilson
  • Born: 2006 (via IVF)
  • Note: Triplet with his brothers Kai and Saxon.
• X Æ A-Xii Musk ('X')
  • Mother: Grimes (Claire Boucher)
  • Born: May 4, 2020
  • Note: Originally named X Æ A-12, the name was legally changed to X Æ A-Xii to comply with California law. His sister is Exa Dark Sideræl Musk.
• Strider Zilis Musk (Twin)
  • Mother: Shivon Zilis
  • Born: November 2021
  • Note: Twin with his sister Azure Astra Alice Zilis. They use their mother's surname as a middle name.
• Techno Mechanicus Musk ('Tau')
  • Mother: Grimes (Claire Boucher)
  • Born: 2022 (existence revealed in 2023)
  • Note: His full name is Techno Mechanicus Musk, and he is nicknamed "Tau," as revealed in Walter Isaacson's biography.
• Romulus Musk
  • Mother: Ashley St. Clair
  • Born: September 2024 (announced February 2025)
  • Note: The latest reported addition to the family, with a name drawn from Roman mythology.
• Seldon Lycurgus Musk
  • Mother: Shivon Zilis
  • Born: 2025 (latest reported birth)
  • Note: The fourth child with Shivon Zilis, his name is a blend of science fiction and ancient Greek history.

The Cryptic Meanings Behind The Unique Musk Sons' Names

Elon Musk’s choice of names for his children is arguably the most talked-about aspect of his personal life, often overshadowing the mothers themselves: Justine Wilson, Grimes, Shivon Zilis, and Ashley St. Clair. The names are not random; they are carefully chosen to reflect his deep-seated interests in futurism, space, mathematics, and classical literature. The more conventional names belong to his older children with his first wife, Justine Wilson, while the most recent children have names that are a blend of the highly technical and the profoundly historical.

X Æ A-Xii: The Name That Broke The Internet

The son of Elon Musk and artist Grimes, X Æ A-Xii, often simply referred to as "X," is perhaps the most famous of all the Musk children. His name is a complex blend of letters and symbols, each with a specific meaning explained by his mother. * 'X' stands for the unknown variable. * 'Æ' is the Elven spelling of AI (Artificial Intelligence) and/or "love." * 'A-Xii' (originally A-12) refers to the Lockheed SR-71 Blackbird's predecessor, an aircraft known for being unarmed but fast. The 'A' also stands for "Archangel," Grimes' favorite song.

Techno Mechanicus: The Mathematical Constant

The existence of Techno Mechanicus Musk, nicknamed "Tau," was a surprise revelation in the 2023 biography of Elon Musk by Walter Isaacson. This name further cements the trend of using technical and mathematical concepts for his sons. * 'Tau' is the mathematical constant 2π (two times Pi), often argued by some mathematicians to be a more fundamental constant than Pi itself. * 'Techno Mechanicus' is a clear nod to technology and machinery, reflecting his father's work at Tesla and SpaceX. The name is a direct, bold statement about the importance of mechanical and technological progress in the modern world.

Seldon Lycurgus: A Blend of Sci-Fi and Ancient Law

The most recent reported son with Neuralink executive Shivon Zilis, Seldon Lycurgus, continues the tradition of drawing from deep, intellectual sources. The name is a powerful combination of science fiction and classical history. * 'Seldon' is widely believed to be a reference to Hari Seldon, the visionary protagonist from Isaac Asimov's seminal *Foundation* science fiction series. Hari Seldon is a mathematician who develops 'psychohistory,' a concept central to predicting the future of humanity—a theme that aligns perfectly with Musk's own long-term, multi-planetary vision for mankind. * 'Lycurgus' is an ancient Greek figure, a legendary lawgiver of Sparta, credited with establishing the city-state's militaristic and communal reforms. This historical reference suggests an appreciation for foundational structures, law, and societal design.

The Latest Sons: Romulus and Seldon Lycurgus

The 2025 news cycle brought two new names to the public’s attention, dramatically increasing the total count of Musk's children. The son with conservative influencer Ashley St. Clair, born in September 2024, was reportedly named Romulus. This name is a direct reference to Roman mythology, specifically one of the legendary founders of Rome, Romulus and Remus. Choosing such a historically significant name, which symbolizes the founding of a great civilization, is entirely consistent with Musk’s pattern of naming his children after figures of monumental importance. The confirmation of Seldon Lycurgus as the fourth child with Shivon Zilis (following twins Strider and Azure, and an unconfirmed fourth child) further highlights Musk's complex and expanding family structure. The frequent use of names from literature, mathematics, and ancient history like *Seldon*, *Lycurgus*, and *Tau* serves to create a powerful topical authority around the Musk family, positioning them at the intersection of innovation and intellectualism. The names of the triplets—Kai, Saxon, and Damian—and the twin, Griffin, who are the oldest surviving sons with Justine Wilson, are comparatively conventional. However, the subsequent children's names, especially X Æ A-Xii, Techno Mechanicus, and the newest additions Romulus and Seldon Lycurgus, have established a clear and unique naming convention for the Musk family: one that is deeply rooted in the pursuit of knowledge, science, and the future of civilization. The names are not just labels; they are philosophical statements.