7 Sons And The 14 Children: The Complete, Updated List Of Elon Musk's Sons' Names

The question of "What is Elon Musk's sons' name?" is not a simple one, as the tech billionaire has one of the most talked-about and rapidly expanding families in the world. As of late December 2025, Elon Musk is a father to a reported 14 children, including a total of seven sons, with three different women. The names of these sons range from traditional to the famously complex and futuristic, reflecting his own unique vision and interests in technology and space exploration.

The most recent revelations in 2024 brought the total number of children to 14, including a new son named Seldon Lycurgus and a daughter named Arcadia, both with Neuralink executive Shivon Zilis. This updated list provides the definitive, chronological guide to all of the sons in the Musk family, detailing their mothers, birth years, and the fascinating stories behind their unconventional names.

The Complete List of Elon Musk's Sons' Names and Biography

Elon Musk has had children with three partners: his first wife, Canadian author Justine Wilson; musician Grimes (Claire Boucher); and Neuralink executive Shivon Zilis. The names of his sons are listed below in chronological order of birth, showcasing the evolution of his naming style from classical to cryptic.

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• Nevada Alexander Musk (Son with Justine Wilson)
  • Born: May 2002
  • Status: Tragically passed away from Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
• Griffin Musk (Twin Son with Justine Wilson)
  • Born: April 2004
  • Status: Twin to Vivian, conceived via IVF.
• Kai Musk (Triplet Son with Justine Wilson)
  • Born: January 2006
  • Status: Triplet with Saxon and Damian, conceived via IVF.
• Saxon Musk (Triplet Son with Justine Wilson)
  • Born: January 2006
  • Status: Triplet with Kai and Damian.
• Damian Musk (Triplet Son with Justine Wilson)
  • Born: January 2006
  • Status: Triplet with Kai and Saxon.
• X Æ A-Xii Musk (Son with Grimes)
  • Born: May 4, 2020
  • Nickname: 'X'
  • Original Name: X Æ A-12, later changed to comply with California law which prohibits numerals in names.
• Techno Mechanicus Musk (Son with Grimes)
  • Born: 2021 (The birth was kept private and revealed in Walter Isaacson's 2023 biography of Musk).
  • Nickname: 'Tau'
• Seldon Lycurgus Musk (Son with Shivon Zilis)
  • Born: Revealed in 2024, part of the latest additions to the family.
  • Status: Twin to daughter Arcadia, and sibling to earlier twins Strider and Azure.

The Fascinating Meaning Behind the Unconventional Names

While the first set of sons—Griffin, Kai, Saxon, and Damian—have relatively conventional names, Elon Musk’s children with Grimes and Shivon Zilis have drawn global attention due to their highly technical, philosophical, and pop-culture-infused names. These naming choices often serve as a direct window into Musk’s interests in science fiction, technology, and the future of humanity.

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

The name of Musk's first son with Grimes, X Æ A-Xii, is arguably the most famous and confusing name in modern celebrity history. The name is a composite of symbols and technical references, with Grimes providing a breakdown of its meaning:

• X: Represents the "unknowable variable."
• Æ: Is the "elven spelling" of 'Ai' (Artificial Intelligence) or 'love.' This character is pronounced as "Ash."
• A-Xii: Refers to the Lockheed SR-71 Blackbird's predecessor, the "Archangel-12," which Musk and Grimes call "the coolest plane ever."

Musk himself confirmed the pronunciation as "X Ash A Twelve." The name was legally changed from 'A-12' to 'A-Xii' (Roman numerals) to comply with state law after the original name was rejected.

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Techno Mechanicus (Tau): The Technical and Philosophical

The name of Musk and Grimes' third child, Techno Mechanicus, nicknamed 'Tau,' was revealed in 2023. This name continues the trend of blending technical and philosophical concepts. The nickname 'Tau' refers to the Greek letter τ, which is often used in physics and mathematics, symbolizing a constant or a specific time period. The full name, Techno Mechanicus, evokes a sense of advanced engineering and a deep connection to machinery and technology, aligning perfectly with Musk's career at companies like SpaceX and Tesla.

Seldon Lycurgus: A Nod to Sci-Fi and Ancient Law

The latest son, Seldon Lycurgus, revealed in 2024, appears to draw inspiration from two distinct, yet equally intellectual, sources.

• Seldon: This is a likely reference to Hari Seldon, a pivotal character in Isaac Asimov's seminal science fiction series, Foundation. Hari Seldon is a mathematician who develops "psychohistory," a predictive science that allows him to foresee the future of the human race. Given Musk's well-known love for science fiction, this is a strong possibility.
• Lycurgus: This name belongs to a legendary Spartan lawgiver credited with creating the militaristic, disciplined society of ancient Sparta. This part of the name suggests an appreciation for foundational law, structure, and historical discipline.

The Sons of Justine Wilson: The Classic Foundation

Musk's first five sons with his ex-wife, Justine Wilson, have names that are far more traditional, contrasting sharply with his later choices. The family began with Nevada Alexander in 2002, whose tragic death led the couple to use In Vitro Fertilization (IVF) to expand their family.

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• The Twins (Griffin and Vivian): Born in 2004, the twins were the first successful IVF births for the couple. While Griffin remains a son, his twin, formerly Xavier, legally changed her name to Vivian Jenna Wilson in 2022, choosing to take her mother's maiden name and distance herself from her father.
• The Triplets (Kai, Saxon, and Damian): Born in 2006, the triplets completed the family unit with Justine Wilson. These names—all strong, single-syllable or two-syllable names—have a classic, timeless quality that stands apart from the high-concept names of his later children.

The full roster of Elon Musk's sons—from Nevada to Seldon Lycurgus—tells a fascinating story of a man whose personal life, much like his professional career, is marked by ambition, a connection to the future, and a flair for the dramatically unconventional.