The Full List Of Elon Musk's Sons: 8 Living 'Musk-eteers' And The Meaning Of Their Futuristic Names (2025 Update)

Elon Musk’s family tree continues to expand at a pace that rivals his most ambitious ventures, generating global fascination and curiosity about the names he chooses for his children. As of late 2025, the billionaire CEO of Tesla and SpaceX is the father of 14 children with four different partners, with a total of eight living sons whose names range from the traditional to the truly futuristic.

This comprehensive, up-to-date guide breaks down the full list of Elon Musk's sons, including the newest additions, and provides the definitive meaning behind the most unique and complex names like X Æ A-Xii and Tau Techno Mechanicus. The choices reflect his deep interest in science, mathematics, and science fiction, creating a family legacy that is as unconventional as the man himself.

Elon Musk's Sons: A Complete Biographical List (2025)

Elon Musk has fathered a total of nine sons, with eight currently living. The names are listed below in chronological birth order, providing a clear timeline of the "Musk-eteers."

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• Nevada Alexander Musk
  • Mother: Justine Wilson
  • Born: 2002 (Deceased at 10 weeks)
• Griffin Musk
  • Mother: Justine Wilson
  • Born: April 2004 (Twin)
• Kai Musk
  • Mother: Justine Wilson
  • Born: 2006 (Triplet)
• Saxon Musk
  • Mother: Justine Wilson
  • Born: 2006 (Triplet)
• Damian Musk
  • Mother: Justine Wilson
  • Born: 2006 (Triplet)
• X Æ A-Xii Musk (Nickname: X)
  • Mother: Grimes (Claire Boucher)
  • Born: May 4, 2020
• Tau Techno Mechanicus Musk (Nickname: Tau)
  • Mother: Grimes (Claire Boucher)
  • Born: 2022 (Existence revealed in 2023)
• Romulus St. Clair
  • Mother: Ashley St. Clair
  • Born: September 2024 (Name revealed in 2025)
• Seldon Lycurgus Musk
  • Mother: Shivon Zilis
  • Born: 2025 (Name revealed in 2025)

Decoding the Futuristic Names: X Æ A-Xii and Tau Techno Mechanicus

While the first five sons bear relatively classic names (Nevada, Griffin, Kai, Saxon, and Damian), the names chosen with musician Grimes (Claire Boucher) and the most recent children are where Musk’s unique approach to naming truly shines. These names are loaded with references to aerospace, mathematics, and science fiction, providing a fascinating glimpse into his personal intellectual interests.

The Meaning of X Æ A-Xii Musk

The name of his eldest son with Grimes, originally X Æ A-12, had to be legally changed due to California state laws that prohibit the use of numbers in a name. The Roman numeral 'XII' (12) was used instead, resulting in X Æ A-Xii.

• X: Represents the "unknown variable," a nod to mathematics and science.
• Æ: The Elven spelling of "Ai," which can mean both "love" and "artificial intelligence." Grimes is known for using "elven" spellings in their children's names.
• A-Xii (A-12): Refers to the Lockheed SR-71 Blackbird's predecessor, the "Archangel-12," which the couple described as the "coolest aircraft ever."

The name is a blend of scientific concepts and pop culture references, perfectly encapsulating the celebrity children's unique background. The boy is affectionately nicknamed "X."

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The Meaning of Tau Techno Mechanicus Musk

The third child with Grimes, a son nicknamed "Tau," was legally named Techno Mechanicus Musk. The name, revealed in Walter Isaacson’s biography of Musk, is a clear homage to technology and advanced scientific concepts.

• Tau: This nickname is a Greek letter (τ) that represents the mathematical constant 2π (two times pi, approximately 6.28), a number often used in engineering and physics.
• Techno: A straightforward reference to technology, innovation, and the future of machinery.
• Mechanicus: A Latin-derived term relating to mechanics, machines, and the engineering discipline, reinforcing the theme of advanced technology.

The combination of these elements makes "Tau Techno Mechanicus" one of the most unique and futuristic names in the famous family's birth timeline.

The Latest Additions: Romulus and Seldon Lycurgus

The most recent additions to the list of Elon Musk's sons have continued the trend of drawing inspiration from history, mythology, and science fiction, maintaining the family's topical authority on unconventional naming.

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Romulus St. Clair (Born 2024)

The son of Musk and conservative journalist Ashley St. Clair, Romulus was born in late 2024. The name Romulus holds deep historical significance:

• Romulus: In Roman mythology, Romulus was the legendary founder of Rome, along with his twin brother Remus. Naming a child Romulus suggests a connection to founding, power, and historical legacy.
• St. Clair: The son's full name is reported as Romulus St. Clair, using his mother's surname.

The name choice, while historical, fits the grand, legacy-building themes often associated with the billionaire.

Seldon Lycurgus Musk (Born 2025)

Seldon Lycurgus, the fourth child with Neuralink executive Shivon Zilis, was born in 2025. This name is particularly rich with literary and historical allusions.

• Seldon: This is widely believed to be a reference to Hari Seldon, a pivotal character in Isaac Asimov's seminal science fiction series, Foundation. Hari Seldon is the creator of "psychohistory," a mathematical science that can predict the future of large populations—a concept aligning perfectly with Musk's futuristic vision.
• Lycurgus: Lycurgus was the legendary lawgiver of Sparta, who is credited with creating the militaristic and disciplined social structure of the ancient Greek state. This choice highlights themes of order, law, and structure.

The combination creates a powerful name that is both a nod to the science fiction genre and a tribute to ancient historical figures, ensuring the child's name is as memorable as his father's career.

The Legacy of the Musk Family Names

The sheer number and unique nature of Elon Musk's children's names—from the traditional to the highly abstract—have made the Musk family a constant subject of public interest. The names are more than just labels; they are a public declaration of Musk's interests in space, technology, history, and the future.

The names of his sons—Nevada, Griffin, Kai, Saxon, Damian, X Æ A-Xii, Tau Techno Mechanicus, Romulus, and Seldon Lycurgus—form a fascinating birth timeline that traces the evolution of his personal life alongside his professional ambitions. As of the current date, the focus remains on the "futuristic names" that continue to pique global curiosity and fuel discussions about celebrity parenting and the boundaries of naming conventions.