14 Children, 3 Mothers: Unpacking The Bizarre And Brilliant Names Of Elon Musk's Sons And Daughters

The question of "What is Elon Musk's son's name?" is far more complex than a simple answer, evolving into a cultural phenomenon that defines the billionaire's unique approach to life and parenthood. As of December 10, 2025, the Tesla and SpaceX CEO is a father to a reported 14 children with three different women, each child bearing a name as unconventional and futuristic as his own ventures. The most famous, of course, is the son born to him and musician Grimes, a child whose original moniker broke California law and required a bizarre legal adjustment.

The names of his children—ranging from Roman numerals and ancient languages to scientific concepts and mythological references—offer a fascinating glimpse into the mind of the world’s wealthiest person. This deep dive explores the full, updated list of the Musk family, focusing on the story behind the most talked-about names, the legal battles, and the significance of each enigmatic title.

Elon Musk: The Complete Biography Profile

Elon Reeve Musk is a South African-born entrepreneur, business magnate, and investor who has become one of the most influential figures in modern technology and space exploration. His career is marked by a relentless pursuit of ambitious, world-changing goals, from sustainable energy to colonizing Mars.

• The Untouchable Privacy 7 Secrets Of Rachel Mcadams And Jamie Lindens Life Beyond The Red Carpet E820e

• Full Name: Elon Reeve Musk
• Born: June 28, 1971, in Pretoria, South Africa
• Age (as of Dec 2025): 54
• Education: University of Pennsylvania (B.A. in Physics and B.S. in Economics)
• Key Companies: Tesla (CEO/Co-founder), SpaceX (CEO/Founder), X (formerly Twitter, Owner/CTO), xAI (Founder), Neuralink (Co-founder), The Boring Company (Founder)
• Net Worth Status: Frequently ranks as the wealthiest person in the world.
• Spouses/Partners: Justine Wilson (married 2000–2008), Talulah Riley (married 2010–2012, 2013–2016), Grimes (Clair Boucher, partner 2018–2021), Shivon Zilis (colleague/partner)

The Story Behind the Name: X Æ A-Xii

The name of Elon Musk's first son with Canadian musician Grimes (Claire Boucher) became an immediate global sensation and the ultimate example of a celebrity baby name gone viral. Born on May 4, 2020, the child was initially named X Æ A-12.

The Meaning of the Original Name (X Æ A-12)

Grimes took to social media to explain the complex, esoteric meaning behind the original name, which broke down as follows:

• X: The unknown variable.
• Æ: The Elven spelling of 'Ai' (love and/or artificial intelligence).
• A-12: The precursor to the SR-71 (Musk’s favorite aircraft), which is described as "no weapons, no defenses, just speed." The 'A' also stands for 'Archangel,' Grimes' favorite song.

The Legal Necessity for Change

The original name, X Æ A-12, ran into a legal roadblock in the state of California, where the child was born. California state law dictates that an official birth certificate can only use the 26 letters of the English alphabet.

• The Unseen Story Jessica Simpsons Battle For Privacy And Body Image In A Digital Age Mlvqa

This rule meant that the numerals ('12') and the unique ligature ('Æ') could not be legally registered. In an effort to comply with the law while preserving the original meaning, the couple made a subtle but crucial modification.

The Official Name: X Æ A-Xii

The official, legally registered name became X Æ A-Xii Musk. The change involved replacing the numerals '12' with the Roman numerals 'Xii,' which is legally permissible in California as they are considered characters of the English alphabet.

The child, affectionately nicknamed 'X,' is one of three children Musk and Grimes share, each with an equally unique and futuristic name. The controversy and curiosity surrounding the name X Æ A-Xii cemented its place in pop culture history, perfectly blending technology, art, and the avant-garde.

• The Enduring Legacy Of Haylor 5 Shocking Facts About Harry Styles And Taylor Swifts Relationship 10 Years Later Sf662

A Growing Family: All of Elon Musk's Children and Their Mothers

Elon Musk's family is one of the largest and most talked-about in the world. The total number of his children, as of the most recent reports in 2024, is 14, though not all names have been publicly or officially confirmed by Musk himself. His children range in age from a few months old to over 21.

Here is a comprehensive list of his children, their names, and the mothers they share with the tech mogul, providing a complete picture of the Musk family tree and the diverse naming conventions used.

Children with Justine Wilson (6 Children)

Musk's first wife, Canadian author Justine Wilson, is the mother of his first six children. Their first son tragically passed away, and they later had a set of twins and a set of triplets.

• Nevada Alexander Musk (2002–2002): Sadly died of Sudden Infant Death Syndrome (SIDS) at 10 weeks old.
• Griffin Musk (Twin, born 2004)
• Vivian Jenna Wilson (Twin, born 2004): Vivian, who is transgender, legally changed her name in 2022 to reflect her gender identity and to take her mother's maiden name.
• Kai Musk (Triplet, born 2006)
• Saxon Musk (Triplet, born 2006)
• Damian Musk (Triplet, born 2006)

Children with Grimes (Clair Boucher) (3 Children)

Musk and Grimes have three children, all known for their highly unusual and symbolic names. They often use nicknames for the children, such as 'X' and 'Y'.

• X Æ A-Xii Musk (Son, born May 2020): Nicknamed 'X'. The most famous name, legally changed from X Æ A-12.
• Exa Dark Sideræl Musk (Daughter, born December 2021): Nicknamed 'Y'. Born via surrogate. The name Exa refers to a supercomputing term, and Sideræl is derived from 'sidereal,' meaning relating to the stars.
• Techno Mechanicus Musk (Son, born 2022): Nicknamed 'Tau'. This name was revealed in Walter Isaacson's 2023 biography of Elon Musk. The name is a fusion of technology and mechanical concepts.

Children with Shivon Zilis (3 Children)

Shivon Zilis, a top executive at Musk's company Neuralink, is the mother of three of his children. The births of the first two were kept private until court documents were revealed.

• Strider Musk (Twin, born 2021): Born via IVF.
• Azure Musk (Twin, born 2021): Born via IVF.
• Arcadia Musk (Daughter, born February 2024): The third child with Zilis, whose birth was confirmed in June 2024. This makes her the most recently confirmed child.

Unconfirmed or Less Public Children (2 Children)

Reports have surfaced about additional children, though they are often less confirmed or have not been publicly detailed by Musk himself, making the total count a fluid number.

• Seldon Musk (Child): Mentioned in some reports as one of the 14 children, but details are scarce.
• Romulus Musk (Son): There was a speculative report in late 2024 that Musk had a 14th child named Romulus with influencer Ashley St Clair, but this remains unconfirmed by reputable news sources.

The Topical Authority of Musk's Naming Conventions

The names chosen for Elon Musk's children are not arbitrary; they are deeply rooted in his interests in science fiction, technology, aerospace, and philosophy. This pattern creates a strong topical authority around the themes of futurism and digital culture.

For instance, 'Techno Mechanicus' and 'Exa Dark Sideræl' are not just unique; they are LSI (Latent Semantic Indexing) keywords that link directly to the core concepts of his businesses: robotics, AI, space, and extreme computing power.

The names serve as a public declaration of his worldview—a blend of the mystical (like 'Sideræl') and the ultra-modern (like 'Techno Mechanicus'). This intentional, thematic naming strategy is what sets his family apart and fuels continuous public fascination, turning a simple birth announcement into a global discussion on language, law, and the future of humanity.

Ultimately, while the question "What is Elon Musk's son's name?" usually refers to the now-famous X Æ A-Xii, the real story is the collective noun: the 'Musk Tribe.' Each child's name is a deliberate, coded message from the world’s most eccentric innovator, ensuring that his family lineage is as memorable and disruptive as his companies.

The ongoing expansion of his family, with the latest confirmation of Arcadia in 2024, ensures that the public will continue to track the next chapter in the saga of the world's most uniquely named children. The names are not just names; they are a legacy.