The 14 Names Of Elon Musk's Sons: Decoding The Billionaire's Most Unusual And Latest Choices (Updated 2025)

The question of "What is Elon Musk's son's name?" is no longer a simple one. As of December 15, 2025, the tech mogul is a father to 14 children with four different women, and his choices for his sons' names are arguably the most unconventional in modern celebrity culture, ranging from an algebraic equation to references to the Roman Empire and science fiction.

The names of his sons—especially the ones he shares with musician Grimes, and the most recent additions with Shivon Zilis and Ashley St. Clair—have sparked global curiosity, debate, and sometimes confusion, reflecting Musk's own fascination with technology, space, and a certain flair for the dramatic. The latest updates in 2025 reveal even more intriguing, mythologically-inspired monikers.

The Complete Biography Profile of Elon Musk's Children (The Musk-eteers)

Elon Musk has been married three times and has fathered 14 children with four different women. This section provides a complete, chronological list of his children, including the unique names of his sons, their mothers, and their birth years.

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• Nevada Alexander Musk (Son)
  • Mother: Justine Wilson (First wife)
  • Born: 2002
  • Status: Tragically passed away at 10 weeks old due to SIDS.
• Griffin Musk (Son) & Vivian Jenna Wilson (Daughter, formerly Xavier Alexander Musk)
  • Mother: Justine Wilson
  • Born: 2004 (Twins)
  • Note: Vivian legally changed her name and gender identity in 2022, choosing to take her mother's maiden name.
• Kai Musk, Saxon Musk, and Damian Musk (Sons)
  • Mother: Justine Wilson
  • Born: 2006 (Triplets)
• X Æ A-Xii (pronounced "Ex Ash A Twelve") (Son, nicknamed 'Lil X')
  • Mother: Grimes (Claire Elise Boucher)
  • Born: May 4, 2020
  • Note: Originally named X Æ A-12, the name was legally changed to use Roman numerals (Xii) to comply with California law, which prohibits numbers in a legal name.
• Exa Dark Sideræl Musk (pronounced "Exa Dark Sigh-deer-ee-el") (Daughter, nicknamed 'Y')
  • Mother: Grimes
  • Born: December 2021 (Via surrogate)
• Strider Musk (Son) & Azure Musk (Daughter)
  • Mother: Shivon Zilis (Neuralink Executive)
  • Born: November 2021 (Twins, revealed in 2022)
• Techno Mechanicus (nicknamed 'Tau') (Son)
  • Mother: Grimes
  • Born: Sometime in 2022 (Revealed in September 2023)
  • Note: This third child with Grimes was kept private for some time.
• Arcadia Musk (Daughter) & Seldon Lycurgus Musk (Son)
  • Mother: Shivon Zilis
  • Born: 2024 (Revealed in 2025)
  • Note: These newest twins were introduced in early 2025, further expanding the Musk family.
• Romulus Musk (Son)
  • Mother: Ashley St. Clair (Conservative Influencer)
  • Born: September 2024
  • Note: The birth and name were revealed in February 2025, making Romulus one of the most recent additions to the list of Elon Musk's sons.

Decoding the Most Unusual Names of Elon Musk’s Sons

While the names Griffin, Kai, Saxon, and Damian are traditional, the more recent sons' names are a masterclass in combining technology, mythology, and abstract concepts. The intention behind these choices often seems to be a nod to his companies, his futuristic vision, or a deep dive into historical and literary figures.

X Æ A-Xii: The Algebraic Son

The name X Æ A-Xii is perhaps the most famous and baffling of all of Elon Musk's children's names. It is a complex blend of letters and symbols, each with a specific, curated meaning explained by his mother, Grimes.

• X: Represents the "unknown variable."
• Æ: Is the Elven spelling of "Ai" (artificial intelligence) or "love."
• A-Xii: This part is a tribute to the Lockheed A-12 Archangel, the precursor to the SR-71 Blackbird, which the couple considers their favorite aircraft—a "fast, non-weaponized" plane.

The original name, X Æ A-12, had to be changed to X Æ A-Xii because California state law prohibits the use of numbers in a legal name, forcing the switch to the Roman numeral equivalent. Despite the complexity, both parents frequently refer to him simply as "X" or "Lil X."

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Techno Mechanicus: The Tech-Focused Moniker

Techno Mechanicus, nicknamed 'Tau,' is the third child shared by Musk and Grimes. This name choice is a clear, unambiguous statement about the family's core interests: technology and engineering.

• Techno: Directly references technology, a field central to Musk's life and career (Tesla, SpaceX, Neuralink).
• Mechanicus: Alludes to mechanics, engineering, and the machine world. It is a term that resonates with science fiction and the concept of a technologically advanced future.
• Tau: The nickname is a letter in the Greek alphabet, often used in mathematics and engineering, fitting the theme of the child's full name.

The name perfectly encapsulates the "Musk-Grimes" naming convention, which prioritizes conceptual and futuristic themes over traditional nomenclature.

The Newest Sons: Romulus and Seldon Lycurgus

The most recent additions to the Musk family, revealed in 2025, continue the trend of drawing inspiration from history, mythology, and science fiction, further cementing the family's topical authority in unique naming conventions.

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Romulus: A Nod to the Roman Empire

The son Romulus, born to Ashley St. Clair, takes his name directly from Roman mythology. Romulus is one of the legendary founders of Rome, alongside his twin brother Remus. According to the myth, the twins were raised by a she-wolf and later founded the city, with Romulus ultimately becoming its first king.

This name choice follows a pattern of powerful, historical, and mythological references, similar to the names of the children he shares with Shivon Zilis, which often have classical or literary roots.

Seldon Lycurgus: Science Fiction Meets Ancient Law

Seldon Lycurgus, one of the twins born to Shivon Zilis in 2024, is a fascinating combination of two deep, intellectual references.

• Seldon: This is believed to be a direct reference to Hari Seldon, a crucial character in Isaac Asimov's seminal Foundation science fiction series. Hari Seldon is a mathematician who develops 'psychohistory,' a theoretical science that can predict the future on a galactic scale, aligning perfectly with Musk's grand, future-focused vision.
• Lycurgus: This name refers to the legendary lawgiver of Sparta, who is credited with establishing the military and social reforms that transformed Sparta into a powerful, disciplined society. This choice speaks to themes of structure, law, and foundational societal change.

The combined name is a clear indicator of the intellectual and ambitious scope of Musk's naming philosophy, blending the distant future of science fiction with the foundational laws of ancient history.

More Traditional Sons: Griffin, Kai, Saxon, and Damian

Musk’s first set of living sons, the twins Griffin and the triplets Kai, Saxon, and Damian, all share more conventional names with his first wife, Justine Wilson. These names provide a stark contrast to the later, more avant-garde choices.

• Griffin: A mythological creature, but a common and strong name.
• Kai: A name with roots in various cultures, often meaning "ocean" or "sea."
• Saxon: A historical name referring to the Germanic people.
• Damian: A traditional name of Greek origin.

These names, while still strong, show a more traditional side to Musk's family life before his later, more public relationships led to the globally recognized, unique names like X Æ A-Xii and Techno Mechanicus. The full list of his sons' names paints a picture of a man whose family life, much like his business empire, is constantly evolving and pushing the boundaries of the conventional.