The 14 Most Unique Names Of Elon Musk’s Children And Their Shocking Meanings (Updated 2025)

The names of Elon Musk's children are arguably as revolutionary and boundary-pushing as his companies, Tesla and SpaceX. With the tech mogul now a father to 14 children with four different mothers, the public interest in the unique monikers he and his partners have chosen has never been higher. As of December 18, 2025, the Musk family has grown, most recently with the confirmation of a child named Romulus, adding yet another layer to the billionaire's increasingly complex and fascinating family tree. This comprehensive guide breaks down the full list of all 14 children, from the traditional to the truly futuristic, exploring the arcane meanings and pop culture references embedded in names like X Æ A-Xii, Exa Dark Sideræl, and the recently revealed Techno Mechanicus, giving you the most current and in-depth information available today.

A Complete Biography of Elon Musk’s 14 Children and Their Mothers

The Tesla and X (formerly Twitter) CEO has made headlines not only for his business ventures but also for his commitment to addressing the "underpopulation crisis" through a large family. Below is a list of all his known children, their birth years, and their mothers, providing a clear map of the Musk dynasty.

• Mother: Justine Wilson (Canadian Author)
  • Nevada Alexander Musk: Born 2002. Tragically passed away at 10 weeks old from Sudden Infant Death Syndrome (SIDS).
  • Griffin Musk (Twin): Born 2004.
  • Vivian Jenna Wilson (Twin): Born 2004. Legally changed her name and gender identity in 2022.
  • Kai Musk (Triplet): Born 2006.
  • Saxon Musk (Triplet): Born 2006.
  • Damian Musk (Triplet): Born 2006.
• Mother: Grimes (Claire Boucher - Musician)
  • X Æ A-Xii Musk: Born May 2020. Nickname "X". Originally named X Æ A-12, the name was legally modified to comply with California law.
  • Exa Dark Sideræl Musk: Born via surrogate in December 2021. Nickname "Y" (or "Why?").
  • Techno Mechanicus Musk: Born June 2022. Nickname "Tau". Revealed in Walter Isaacson's 2023 biography of Elon Musk.
• Mother: Shivon Zilis (Director of Operations at Neuralink)
  • Strider Zilis Musk (Twin): Born November 2021.
  • Azure Zilis Musk (Twin): Born November 2021.
• Mother: Ashley St. Clair (Author/Commentator)
  • Romulus Musk: Born September 2024. Name revealed in early 2025.

The Cryptic Meanings Behind the Grimes Children’s Names

The three children Elon Musk shares with Canadian musician Grimes (Claire Boucher) have names that sound less like traditional monikers and more like futuristic passwords or scientific equations. Each name is packed with deeply personal, scientific, and pop culture references.

X Æ A-Xii: The Archangel and the A-12

The first child of Musk and Grimes, originally named X Æ A-12, had to be slightly altered to X Æ A-Xii because California law prohibits the use of numerals in a legal name. The pronunciation, according to Musk, is simply "X Ash A Twelve."

• X: Represents the unknown variable, a nod to mathematics and science.
• Æ: The Elven spelling of "Ai" (love and/or Artificial Intelligence), a core theme in Grimes' work.
• A-Xii: Refers to the "Archangel-12," which is the precursor to the SR-71 Blackbird, the couple's favorite aircraft. The "A" also stands for "Archangel," which is Grimes' favorite song.

This name is a perfect blend of high-tech engineering, mathematical symbolism, and esoteric language, reflecting both parents' interests in space exploration, future technology, and avant-garde art.

Exa Dark Sideræl Musk: A Universe of Meaning

The couple's second child, a daughter, was born via surrogate in late 2021 and given the equally complex name Exa Dark Sideræl Musk, though she is affectionately known by the simple nickname "Y." The meaning of the components is a journey through astrophysics and supercomputing:

• Exa: A reference to exaFLOPS, a term in supercomputing that measures the ability to perform one quintillion floating-point operations per second. It symbolizes the extreme scale of computation.
• Dark: Refers to Dark Matter and the "unknown unknowns" of the universe, a concept that makes up the vast majority of the cosmos and remains one of science's greatest mysteries.
• Sideræl: Pronounced "sigh-deer-ee-elle," this term is described by Grimes as a more "elven" spelling of sidereal, meaning "of or pertaining to the stars or constellations." It represents the true time of the universe, not the earth's relative time.

Tau Techno Mechanicus: The Warhammer Reference

The name of the third child with Grimes, a son born in 2022, was kept secret for a long time until it was revealed in Musk’s official biography: Techno Mechanicus, with the nickname "Tau." The name is a clear and direct reference to the Adeptus Mechanicus, a faction in the popular tabletop game and fictional universe Warhammer 40,000. This group is known for their worship of the Machine God and their relentless pursuit of technology, a theme that resonates deeply with Musk's own ventures. The nickname Tau is a Greek letter, $\tau$, often used in mathematics and physics to represent various concepts, including time constants or torque, keeping in line with the family's tradition of scientific symbolism.

The Latest Addition: Romulus Musk and the Traditional Twins

While the names chosen with Grimes garner the most attention, the names of the other children also hold a mix of classic, literary, and subtle scientific influences.

The Zilis Twins: Strider and Azure

In late 2021, just weeks before the birth of Exa Dark Sideræl, Musk welcomed twins with Neuralink executive Shivon Zilis: a son named Strider Zilis Musk and a daughter named Azure Zilis Musk. These names are relatively more traditional, with a literary and natural flavor:

• Strider: A name with a fantasy or literary appeal (such as the character Aragorn's nickname in *The Lord of the Rings*).
• Azure: A color that represents the deep blue of the sky or the ocean, evoking a sense of natural wonder.

The use of Zilis as the middle name for both children acknowledges their mother's identity and is a common practice in many families.

The Newest Son: Romulus Musk

The most recent confirmed addition to the family is a son named Romulus, born to author and political commentator Ashley St. Clair in September 2024, with the name being publicly revealed in early 2025. The name Romulus is a powerful choice, steeped in classical history. In Roman mythology, Romulus and his twin brother Remus are the legendary founders of Rome. According to the legend, they were raised by a she-wolf, symbolizing resilience, strength, and the foundation of a great civilization. This name, while traditional, aligns with Musk's grand, almost mythological vision for humanity's future, from colonizing Mars to building the foundations of a new technological age. The sheer variety of names, from the highly conceptual X Æ A-Xii and Exa Dark Sideræl to the mythologically significant Romulus and the more conventional Griffin and Saxon, underscores Elon Musk's unique approach to life, fatherhood, and his desire to leave a lasting, unconventional legacy on the world.