The 10 Sons Of Elon Musk: Decoding The World’s Most Unique Baby Names, From X Æ A-XII To Romulus
As of December 2025, the family tree of tech mogul Elon Musk continues to expand, featuring a growing number of children with some of the most unconventional and headline-grabbing names in modern history. The question of "What is Elon Musk's son's name?" no longer has a single answer, but rather a fascinating, complex list that spans from traditional, classic monikers to names inspired by mathematics, aerospace, and artificial intelligence.
This comprehensive, up-to-date guide reveals the complete list of Musk's sons, detailing the recent, surprising additions, the unique meanings behind his most famous choices, and the remarkable women who are the mothers of the children. The names are a clear reflection of Musk's deep interests in science, technology, and mythology, creating a legacy that is anything but ordinary.
The Musk Dynasty: A Complete List of Sons and Their Mothers
Elon Musk is a father to a large family, with a reported total of 13 children shared with four different women. The names of his sons, in particular, showcase a deliberate blend of the conventional and the futuristic. The following is a chronological list of his sons, including their mothers and a brief profile of the women who co-parent the "Musk-eteers."
- Nevada Alexander Musk (b. 2002, d. 2002)
- Mother: Justine Wilson.
- Profile: Nevada was the first child of Musk and his first wife, Canadian author Justine Wilson. He tragically died of SIDS at just 10 weeks old.
- Griffin Musk (b. 2004)
- Mother: Justine Wilson.
- Profile: Griffin is one of a set of twins, alongside his sister, Vivian Jenna Wilson.
- Kai Musk (b. 2006)
- Mother: Justine Wilson.
- Profile: Kai is one of triplets, along with his brothers Saxon and Damian.
- Saxon Musk (b. 2006)
- Mother: Justine Wilson.
- Profile: Part of the triplets born via IVF.
- Damian Musk (b. 2006)
- Mother: Justine Wilson.
- Profile: The third of the triplets. Justine Wilson is a fantasy author whose works include the novel BloodAngel. She met Musk while they were students at Queen’s University in Ontario.
- X Æ A-XII Musk (b. 2020)
- Mother: Grimes (Claire Boucher).
- Profile: The first child with the Canadian musician and artist Grimes.
- Techno Mechanicus Musk (b. 2022)
- Mother: Grimes (Claire Boucher).
- Profile: Known by the nickname "Tau," his existence was revealed in Walter Isaacson's biography of Musk. Grimes is an experimental pop singer and producer, known for her unique aesthetic and stage name, Claire Boucher.
- Strider Musk (b. 2021)
- Mother: Shivon Zilis.
- Profile: Strider is one of a set of twins, alongside his sister Azure.
- Seldon Lycurgus Musk (b. 2023)
- Mother: Shivon Zilis.
- Profile: Zilis is a Canadian venture capitalist and a top executive at Neuralink, one of Musk’s key companies. She is an artificial intelligence expert and former board member at OpenAI.
- Romulus Musk (b. September 2024)
- Mother: Ashley St. Clair.
- Profile: The newest confirmed son, his name was revealed by his mother, Ashley St. Clair, an American author, conservative political commentator, and journalist.
Decoding the Code Names: X Æ A-XII and Techno Mechanicus
The names of the sons Musk shares with musician Grimes (Claire Boucher) are arguably the most famous and perplexing celebrity baby names in history. They represent a fusion of technology, philosophy, and pop culture, which provides a rich source of topical authority and entity relevance.
X Æ A-XII Musk: Pronunciation and Meaning
Originally named X Æ A-12, the name was legally changed to X Æ A-XII to comply with California state law, which prohibits numbers in a name, replacing the digit '12' with the Roman numeral 'XII.' The pronunciation itself is a puzzle, but both parents have offered an explanation.
- Pronunciation: "X Ash A Twelve."
- X: Stands for "the unknown variable."
- Æ: Grimes’ "Elven spelling" of AI (Artificial Intelligence) or "love." The character 'Æ' is also known as 'ash' in some languages.
- A-XII: A reference to the Lockheed A-12 Archangel, the precursor to the SR-71 Blackbird, which Grimes called their favorite aircraft—"no weapons, no defenses, just speed. Great in battle, but non-violent."
The name is a perfect encapsulation of the parents' interests: a blend of high-tech aerospace engineering and artistic, quasi-mystical language. The child is most commonly referred to by the simple nickname, X.
Techno Mechanicus Musk: The Meaning of 'Tau'
Musk’s third child with Grimes, a son named Techno Mechanicus, is known by the nickname Tau.
- Techno Mechanicus: The name itself suggests a fusion of technology and engineering. "Techno" refers to technology, while "Mechanicus" evokes a sense of mechanical or technical mastery, aligning with Musk's career in engineering and robotics.
- Tau: The nickname is a direct reference to the Greek letter $\tau$, which is a mathematical constant equal to $2\pi$ (two times pi), often used in geometry and physics. The choice of a mathematical constant for a nickname further solidifies the theme of science and intellect in Musk’s children's names.
The Newest Additions: Romulus and Seldon Lycurgus
The latest updates to the Musk family tree feature two new sons, both with names that carry significant historical and mythological weight, a clear contrast to the high-tech monikers of X and Tau. These new additions underscore a shift toward names that reference historical founders and influential figures.
Romulus Musk: The Founder's Name
The son born to conservative political commentator Ashley St. Clair in September 2024 was named Romulus.
- Romulus: The name is famously associated with the legend of the founding of Rome. According to Roman mythology, Romulus and his twin brother, Remus, were the founders of the city of Rome. Choosing this name suggests a theme of foundation, new beginnings, and empire-building, entities that resonate with Musk’s own ambitions in space and technology.
- Ashley St. Clair: The mother is a prominent figure in conservative media, an author and journalist who confirmed the birth of her son, Romulus, in early 2025.
Seldon Lycurgus Musk: A Nod to Sci-Fi and Law
Another recent addition is Seldon Lycurgus, a son born to Neuralink executive Shivon Zilis.
- Seldon: This name is a likely reference to Hari Seldon, a fictional character in Isaac Asimov's seminal science fiction series, Foundation. Hari Seldon is a brilliant mathematician who develops "psychohistory," a field that uses mathematics to predict the future of large populations. This choice is deeply resonant with Musk's futuristic vision and love for science fiction literature.
- Lycurgus: This name refers to the legendary lawgiver of Sparta, who is credited with creating the militaristic and disciplined social structure of the ancient Greek city-state. The combination of "Seldon" and "Lycurgus" creates a name that fuses futuristic predictive science with ancient law and order.
- Shivon Zilis: Zilis, a Canadian AI expert, is the mother of four of Musk's children, including twin son Strider and daughter Azure.
The Legacy of Traditional Names: Griffin, Kai, Saxon, and Damian
Before the arrival of X Æ A-XII, Musk and his first wife, Justine Wilson, chose names that, while classic, still carry powerful and distinct meanings rooted in history, mythology, and various cultures. These names highlight a more conventional naming phase in the early years of the Musk family.
- Griffin Musk: This name is of Welsh and Irish origin, meaning "strong lord" or "prince." It also refers to the mythical creature, the Gryphon, a fabled monster that is half-eagle and half-lion, symbolizing strength and courage.
- Kai Musk: A short, powerful name with diverse cultural roots. In Hawaiian, it means "sea" or "ocean." In Japanese, it can mean "forgiveness," and in Chinese, it can mean "victory." This multicultural name reflects a broad, universal appeal.
- Saxon Musk: Of German and English origin, the name refers to the Germanic tribe that settled in Britain. It can also mean "people of the dagger" or "short sword," referencing the kind of knife known as a sax.
- Damian Musk: Derived from the Greek name Damianos, this name means "to tame" or "subdue." It is also associated with Saint Damian, the patron saint of physicians.
From the tragically short life of Nevada Alexander to the unique, code-like moniker of X Æ A-XII, and the newest, historically significant additions of Romulus and Seldon Lycurgus, the names of Elon Musk's sons are a compelling study in the intersection of futurism, mythology, and personal legacy. Each choice is a deliberate statement, ensuring that the names of the Musk dynasty will continue to generate curiosity and discussion for years to come.
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