Elon Musk's family tree spans multiple relationships, high-profile co-parenting arrangements, and some of the most unconventional naming choices in contemporary pop culture. Across four different partners—Justine Wilson, Grimes, Shivon Zilis, and Ashley St. Clair—the Tesla and SpaceX CEO is a father to a large family. Understanding who they are requires looking past the viral headlines and examining the actual birth order, backgrounds, and meanings behind each sibling group.
The Children with Justine Wilson
Elon Musk's first marriage was to Canadian author Justine Wilson, with whom he shared his earliest experiences of fatherhood. This branch of the family features more traditional names rooted in history, literature, and family heritage.
- Nevada Alexander Musk (2002): Born as Musk's first child, Nevada tragically passed away from sudden infant death syndrome (SIDS) at just 10 weeks old.
- Griffin and Vivian Jenna Wilson (2004): Following Nevada's passing, the couple turned to in vitro fertilization (IVF) and welcomed twins. Griffin remains largely out of the public eye. Vivian legally changed her name and gender identity in 2022, severing ties with her biological father.
- Kai, Saxon, and Damian Musk (2006): Following the twins, Wilson gave birth to triplet boys via IVF. Like their older brother Griffin, they have largely maintained private lives away from corporate spotlights.
The Children with Grimes
Musk's high-profile relationship with musician Claire Boucher, known professionally as Grimes, produced three children whose names sparked worldwide media debates and legal adjustments in California.
- X Æ A-Xii (2020): Originally registered as X Æ A-12, his name was adjusted because California law does not permit numbers or symbols on birth certificates. The components represent an unknown variable, an elven spelling of artificial intelligence, and a favorite aircraft. He is commonly called "X".
- Exa Dark Sideræl Musk (2021): Born via surrogate, she goes by the nickname "Y". Her first name references the supercomputing term exaflop, while Sideræl is an elven-inspired spelling of sidereal.
- Techno Mechanicus (2022): Publicly revealed during the rollout of Walter Isaacson's biography, he is affectionately nicknamed "Tau", drawing inspiration from mathematics and physics.
The Children with Shivon Zilis
Shivon Zilis, an executive at Neuralink, shares multiple children with Musk. Their naming convention shifts toward literary, mythological, and ruggedly traditional choices.
- Strider and Azure (2021): Born as twins shortly before the arrival of Exa Dark Sideræl. Strider evokes literary heroism, while Azure references a bright, clear blue sky.
- Arcadia (2024): Born in early 2024, her arrival was integrated into family announcements shared by Zilis.
- Seldon Lycurgus: A younger son whose addition to the family was publicly confirmed by Zilis, carrying historical and sci-fi literary weight.
The Child with Ashley St. Clair
- Romulus (2024): Author and influencer Ashley St. Clair announced the birth of her son, Romulus, noting Musk as the father. The name draws directly from Roman mythology, tracing back to the legendary co-founder of Rome.
Frequently Asked Questions
How many total children does Elon Musk have?
As of late 2026, Elon Musk has 14 publicly known children shared among four different mothers.
Why did Grimes and Musk change their first child's name?
California state regulations prohibit numerals and non-English letters on official birth records. They substituted the number "12" with the Roman numeral "Xii" to comply with state law.
Do all of Musk's children use his last name?
Most carry the Musk surname, though some utilize hyphenated formats or their mother's last name as a middle or primary identifier, and Vivian Jenna Wilson legally changed her surname to distance herself from her father.
Where can I read official statements about the family?
Public updates regarding corporate milestones or personal announcements are occasionally shared directly through X, while broader biographical context is documented via Reuters.
