The 10 Sons Of Elon Musk: Names, Ages, And The Shocking Stories Behind Their Hyper-Unique Names (Updated December 2025)
The family tree of tech billionaire Elon Musk continues to be one of the most talked-about and rapidly-expanding personal stories in the world, with the latest reports in late 2024 and early 2025 confirming his total number of children has reached a staggering 14. This cohort, affectionately dubbed the 'Musk-eteers' by some, includes a notable 10 sons, each carrying a name that ranges from the traditional to the truly futuristic and code-like, reflecting the unique personalities of their parents and the Tesla/SpaceX CEO's own penchant for the unconventional. As of December 2025, the newest additions and name revelations ensure the spotlight remains firmly fixed on the next generation of the Musk dynasty.
The sheer size and complexity of the Musk family, which includes children with four different partners, is a direct reflection of Musk's public stance on birth rates and his belief that "smart people should have more babies." The most recent and surprising revelations, including the secret birth of a son named Techno Mechanicus and the recent confirmation of a child named Romulus, have added new layers to an already fascinating narrative, proving that the future of the Musk family is as unpredictable as his ventures into space and electric vehicles.
The Complete Biography of Elon Musk's Sons (Updated December 2025)
Elon Musk currently has a total of 14 children with four different women: author Justine Wilson, musician Grimes (Claire Boucher), Neuralink executive Shivon Zilis, and conservative author Ashley St. Clair. Of these 14, 10 are sons, including one who tragically passed away in infancy. The following is a chronological list of his sons, their mothers, and their current approximate age as of December 2025.
- Nevada Alexander Musk (Son with Justine Wilson)
- Born: May 2002
- Status: Tragically passed away at 10 weeks old from Sudden Infant Death Syndrome (SIDS).
- Griffin Musk (Son with Justine Wilson)
- Born: April 2004 (Twin to Vivian Jenna Wilson)
- Age: 21
- Note: Born via IVF.
- Kai Musk (Son with Justine Wilson)
- Born: January 2006 (Triplet)
- Age: 19
- Note: Born via IVF, triplet with Saxon and Damian.
- Saxon Musk (Son with Justine Wilson)
- Born: January 2006 (Triplet)
- Age: 19
- Damian Musk (Son with Justine Wilson)
- Born: January 2006 (Triplet)
- Age: 19
- X Æ A-Xii Musk ('X') (Son with Grimes)
- Born: May 4, 2020
- Age: 5
- Note: Originally named X Æ A-12, the legal name was changed to X Æ A-Xii to comply with California law regarding the use of Roman numerals.
- Strider Musk (Son with Shivon Zilis)
- Born: November 2021 (Twin to Azure)
- Age: 4
- Note: Born weeks before his half-sister Exa Dark Sideræl. The twins' names were revealed in late 2022.
- Azure Musk (Son with Shivon Zilis)
- Born: November 2021 (Twin to Strider)
- Age: 4
- Techno Mechanicus ('Tau') (Son with Grimes)
- Born: Circa Late 2021/Early 2022
- Age: Approximately 3-4
- Note: His existence and unique name were kept secret until they were revealed in Walter Isaacson's 2023 biography of Elon Musk. He is nicknamed "Tau."
- Romulus Musk (Son with Ashley St. Clair)
- Born: September 2024
- Age: 1
- Note: The newest confirmed son, whose birth was announced by his mother, Ashley St. Clair, in February 2025. The name Romulus is a classical reference, fitting the unique naming convention.
The Stories Behind the Most Futuristic Names
While the triplet sons Kai, Saxon, and Damian, and the twin son Griffin, carry relatively traditional names, the later additions to the family have drawn worldwide media attention for their highly unconventional and futuristic monikers. These names not only stand out but also offer a glimpse into the tech and science-fiction interests of Musk and his partners.
X Æ A-Xii: The Code Name That Broke the Internet
Born in May 2020, the first son of Elon Musk and Grimes, originally named X Æ A-12, instantly became a global phenomenon. The name's complexity led to a legal necessity for change, as California law prohibits numbers in a legal name. The final legal name is X Æ A-Xii, which simply replaces the number '12' with the Roman numeral 'Xii'.
Grimes has provided a breakdown of the name's meaning:
- X: The unknown variable.
- Æ: The Elven spelling of "Ai" (love and/or artificial intelligence).
- A-Xii (formerly A-12): A reference to the Lockheed A-12 Archangel, a reconnaissance aircraft that the couple admired for being "great in combat, but non-violent."
Despite the complex legal name, the child is affectionately known by the simple nickname, "X."
Techno Mechanicus ('Tau'): The Secret Son of Science Fiction
Perhaps the most shocking revelation in the Musk family saga came with the publication of Walter Isaacson's 2023 biography, which disclosed the existence of a third child with Grimes, a son named Techno Mechanicus, who goes by the nickname "Tau." His birth was a closely guarded secret, reportedly occurring via surrogate in late 2021 or early 2022.
The name itself is deeply rooted in science fiction and technology. "Techno Mechanicus" evokes images of advanced engineering and a mechanical future, while "Tau" is the Greek letter often used in mathematics and physics, particularly for time constants or in the context of the Warhammer 40,000 universe, reflecting Grimes' and Musk's shared interests in futuristic concepts. The existence of Tau, born just weeks after the twins with Shivon Zilis, underscores the incredible pace of growth in the Musk family.
The Older Sons: Name Changes and Public Life
Musk's first set of living children with his ex-wife, Justine Wilson, includes the twin son Griffin and the triplet sons Kai, Saxon, and Damian. While they have largely maintained a low profile, one of the twins, formerly a son named Xavier Alexander Musk, legally changed her name and gender in 2022 to Vivian Jenna Wilson, publicly distancing herself from her father. This significant event brought attention to the older children's desire for privacy and independence from their father's public persona, a crucial element in the ongoing story of the Musk family.
The younger twin sons, Strider and Azure, born to Neuralink executive Shivon Zilis, were also kept largely out of the public eye until a court filing confirmed their names in late 2022. Zilis, a high-ranking executive at Musk's Neuralink and X (formerly Twitter), shares a professional and personal bond with the billionaire, with the twins serving as a testament to their close working relationship and shared belief in the importance of population growth.
The most recent son, Romulus, born to Ashley St. Clair in September 2024 and confirmed in early 2025, continues the trend of unique, historically-significant names. Romulus is the legendary founder of Rome, a name that carries weight and a sense of destiny, fitting for a child in a lineage defined by world-changing ambition.
Musk's Views on Fatherhood and the Future
Elon Musk has been vocal about his desire to combat "underpopulation" and has stated that he is doing his part to help the demographic crisis. However, he has also admitted that it is "impossible" to spend an equal amount of time with all his children due to his demanding schedule running companies like Tesla, SpaceX, and X. This admission highlights the unique challenges of his massive, non-traditional family structure.
The future of Musk's sons—ranging from the 21-year-old Griffin to the one-year-old Romulus—remains a subject of intense speculation. Will they follow in their father's footsteps in space exploration and technology? Will they continue the trend of unique, code-like names for their own children? As the Musk dynasty continues to grow and evolve, the stories of X Æ A-Xii, Techno Mechanicus, Romulus, and their brothers will undoubtedly remain a fascinating intersection of celebrity, technology, and futuristic philosophy.
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