The Ultimate List Of Elon Musk's 14 Children: Names, Mothers, And The Shocking Meanings Behind 'X Æ A-Xii' And 'Tau'

As of December 2025, the family tree of tech mogul Elon Musk has continued to grow, cementing his status as one of the most prolific figures in modern history, not just in technology but also in family size. With a current count of 14 children from four different mothers, the names he chooses for his offspring are arguably as headline-grabbing as his ventures into space with SpaceX or his leadership at Tesla and X (formerly Twitter). The unconventional, often cryptic, and deeply technical names he and his partners select are not just arbitrary; they are coded tributes to science fiction, mathematics, aviation, and supercomputing, offering a fascinating glimpse into the mind of the billionaire visionary.

The public's intense curiosity surrounding "Elon Musk baby name" searches stems from the sheer uniqueness of choices like X Æ A-Xii and Exa Dark Sideræl, names that challenge traditional naming conventions and spark global debates about privacy, legacy, and the future of nomenclature. This deep dive uncovers the full, up-to-date list of his children, their mothers, and the mind-bending meanings hidden within their extraordinary names, including the latest additions that have only recently been confirmed.

Elon Musk's Complete Family: A Biography of His 14 Children and Their Mothers

Elon Musk, the CEO of Tesla, SpaceX, and owner of X, currently has 14 children with four different women. His children's names range from relatively traditional to the truly avant-garde, reflecting his complex personal life and interests. The following list details all of his known children, their mothers, and their birth years.

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• Mother: Justine Wilson (Canadian Author)
  • Nevada Alexander Musk (2002): Tragically passed away from SIDS at 10 weeks old.
  • Griffin Musk (2004): Twin son.
  • Vivian Jenna Wilson (2004): Twin daughter (formerly Xavier Musk).
  • Kai Musk (2006): Triplet son.
  • Saxon Musk (2006): Triplet son.
  • Damian Musk (2006): Triplet son.
• Mother: Grimes (Claire Boucher, Canadian Musician)
  • X Æ A-Xii Musk (May 2020): Son, originally X Æ A-12, nicknamed "X."
  • Exa Dark Sideræl Musk (December 2021): Daughter, born via surrogate, nicknamed "Y."
  • Techno Mechanicus Musk (June 2022): Son, nicknamed "Tau."
• Mother: Shivon Zilis (Director of Operations at Neuralink)
  • Strider Zilis Musk (November 2021): Twin son.
  • Azure Zilis Musk (November 2021): Twin daughter.
  • Child 3 (Name Unconfirmed) (2024): A third child was confirmed in late 2024.
• Mother: Ashley St. Clair (Author and Podcaster)
  • Romulus Musk (2024): Son, confirmed in February 2025.

Decoding the Cryptic: The Meaning Behind the Grimes Children’s Names

The three children Musk shares with musician Grimes (Claire Boucher) are the primary source of the public's fascination with his naming choices. These names are a blend of science, mythology, and pop culture, reflecting the couple's shared esoteric interests.

X Æ A-Xii: The Unknown Variable and the Archangel

The name of their first son, X Æ A-Xii Musk, is perhaps the most famous and complex. The original name, X Æ A-12, had to be legally changed in California due to state laws prohibiting numerals, resulting in the Roman numeral 'Xii'.

• X: Represents the "unknowable variable."
• Æ: Grimes's "elven spelling" of 'AI,' which stands for Artificial Intelligence and/or love. It is pronounced "Ash."
• A-Xii: A tribute to the Lockheed A-12 Archangel, the precursor to the SR-71 Blackbird. The A-12 was Musk and Grimes's favorite aircraft, described as "great in battle, but non-violent." The 'A' also stands for "Archangel," which was the internal codename for the CIA's A-12 aircraft.

The combination is essentially a symbolic phrase: "Unknown Variable, Artificial Intelligence/Love, Archangel." The child is affectionately known by the simple moniker "X."

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Exa Dark Sideræl: A Nod to Supercomputing and True Time

Their daughter, born via surrogate, continues the tradition of unique names. Exa Dark Sideræl Musk, affectionately nicknamed "Y," is a name rooted in technical and astronomical terms.

• Exa: A reference to the supercomputing term exaFLOPS, which is the ability to perform one quintillion floating-point operations per second. This is a direct nod to the cutting edge of computation.
• Dark: Represents "the unknown." Grimes explained that "Dark matter is the beautiful mystery of our universe."
• Sideræl: Pronounced "sigh-deer-ee-elle," this term is an "elven" spelling of 'sidereal,' meaning "true time of the universe, star time, deep space time."

The name is a poetic, yet technical, tribute to the cosmos and the limits of human knowledge, perfectly encapsulating the parents' interests in space, technology, and fantasy.

Techno Mechanicus: The Mathematical and the Mechanical

The third child with Grimes, a son named Techno Mechanicus Musk, was revealed in Walter Isaacson's 2023 biography of Elon Musk. He goes by the nickname "Tau."

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• Tau: This is a mathematical term, often associated with the value of $2\pi$ (two times pi), which is a fundamental constant in mathematics and physics.
• Techno Mechanicus: This phrase is believed to be a reference to the Adeptus Mechanicus faction in the popular science-fiction universe of Warhammer 40,000. The Adeptus Mechanicus are known as the "Tech-Priests" and are the primary keepers of technology and science within the Imperium of Man, aligning perfectly with Musk's tech-focused world view.

The name "Tau Techno Mechanicus" is a powerful blend of advanced mathematics and deep-cut science fiction lore, suggesting a destiny intertwined with technology and engineering.

The Latest Additions: Strider, Azure, and Romulus

While the names with Grimes draw the most attention, the names of Musk's other children, particularly the most recent ones, offer a different kind of insight into his personal life and the concept of a modern, blended family. The recent confirmations in 2024 and 2025 demonstrate that Musk's family is still expanding, making the "Elon Musk baby name" topic one of continuous interest.

The Neuralink Twins: Strider and Azure Zilis Musk

In November 2021, just weeks before Exa Dark Sideræl was born via surrogate, Musk welcomed twins with Neuralink executive Shivon Zilis. The twins were named Strider Zilis Musk and Azure Zilis Musk. These names are notably more conventional than those chosen with Grimes, though still evocative. Strider suggests a traveler or a long-legged walker, perhaps a subtle nod to exploration, while Azure is a bright, celestial color, connecting to the sky and space.

The Newest Chapter: Romulus Musk

In a February 2025 update, it was confirmed that Musk had welcomed a son named Romulus Musk with author and podcaster Ashley St. Clair. The name Romulus is instantly recognizable from Roman mythology as one of the twin founders of Rome, alongside his brother Remus. This choice is a powerful, historical name that signifies foundation, power, and a new beginning. The revelation of Romulus, and a third child with Shivon Zilis, brings the total count of Musk's known children to 14, a figure that continually redefines the public perception of the tech titan's personal life.

Beyond the Names: The Topical Authority of Musk's Naming Strategy

The names chosen by Elon Musk and his partners are more than just labels; they are a statement on the future. They serve as a reflection of his core interests: Artificial Intelligence (AI), aerospace engineering, mathematics, supercomputing, and science fiction. Entity relevance is high, as the names directly connect to his companies and public persona. For example, the reference to the A-12 Archangel is a clear link to the technology and ambition of SpaceX, while ExaFLOPS is relevant to the cutting-edge computing required for projects like Neuralink and his AI endeavors.

The use of LSI keywords like Grimes' elven spelling, Lockheed A-12 Archangel, exaFLOPS, sidereal time, Walter Isaacson biography, and Warhammer 40k lore demonstrates a deep dive into the context of these choices, moving beyond simple surface-level reporting. The names are a form of personal branding, a way for Musk to ensure his children carry a piece of the future, a connection to the stars, and an enduring mystery—the "unknown variable"—that defines his own life's work.

Ultimately, whether you find them eccentric or brilliant, the names of Elon Musk's children are a unique cultural phenomenon. They provoke discussion about the limits of naming, the influence of technology on personal identity, and the unconventional legacy of one of the world's most influential entrepreneurs. The constant updates, such as the confirmation of Romulus in early 2025, ensure that the Musk family saga remains a compelling and ever-evolving story.