When Elon Musk and musician Grimes welcomed their first child together in May 2020, they didn't just announce a birth; they launched a global guessing game. The infant was given a designation that looked more like an engineering schematic than a birth certificate: X Æ A-12. Media outlets scrambled, podcasts dissected every syllable, and state registrars shook their heads. But this viral moniker is only part of a much larger picture spanning multiple relationships and wildly contrasting naming philosophies.
Understanding the logic behind these choices requires looking past the shock value. Musk's family tree features a split personality. On one side are traditional, classic identifiers; on the other are futuristic, sci-fi code words that sound engineered on an assembly line.
Decoding X Æ A-12: The Breakdown
The name that started the modern frenzy carries layers of personal symbolism contributed by both parents. Even the pronunciation sparked initial confusion until clarifications cleared the air.
- X: The unknown variable, representing mathematical mystery and futuristic detachment.
- Æ: The elven spelling of AI, standing for artificial intelligence as well as shorthand for love or artificial insight.
- A-12: A joint nod to the precursor of the Lockheed SR-71 aircraft—beloved by the parents for being great in battle, though non-violent—and Archangel, Grimes's favorite song.
Legal hurdles struck almost immediately. California law dictates that vital statistics records can only use the 26 alphabetical characters of the English language. Numbers and rare symbols cannot live on an official state birth certificate. Because of this restriction, the parents adjusted the spelling to X Æ A-Xii, swapping the Arabic numeral 12 for Roman numerals while keeping the spoken pronunciation intact as X Ash A Twelve.
Expanding the Family Tree: Grimes and Shivon Zilis Additions
The futuristic naming convention didn't stop with the firstborn. Subsequent arrivals with Grimes and executive Shivon Zilis introduced even deeper layers of aerospace and literary influence.
- Exa Dark Sideræl: Arriving via surrogate, the couple's daughter features "Exa" referencing supercomputing prefix exafloops, "Dark" pointing to the unknown and dark matter, and "Sideræl" representing the elven spelling of sidereal, the true time of the stars.
- Techno Mechanicus: Often called "Tau," this son's name leans hard into mechanical engineering and sci-fi motifs.
- Strider and Azure: Twins born to Shivon Zilis who bridge a slightly more terrestrial gap, though still retaining rare, distinctive edges.
- Seldon Lycurgus and Arcadia: Later additions with Zilis that draw inspiration from Isaac Asimov’s Foundation series and classical history, showing a heavy lean toward speculative fiction and antiquity.
The Traditional Roots: First Marriage Choices
Long before rockets routinely landed on autonomous drones, Musk shared six children with Canadian author Justine Wilson. This early chapter produced classical names grounded in history, literature, and geography:
- Nevada Alexander: Born in 2002, tragically passing away from sudden infant death syndrome at ten weeks old.
- Griffin and Vivian: Twins born via IVF in 2004. Vivian later legally changed her name and severed ties in 2022.
- Kai, Saxon, and Damian: Triplets born in 2006, sporting sturdy Anglo-Saxon and Greek roots.
This stark contrast highlights an evolution. The earlier children received names that fit comfortably inside standard school attendance rosters, whereas later additions function as philosophical statements about technology, space, and artificial intelligence.
Frequently Asked Questions
How do you actually pronounce X Æ A-Xii?
It is pronounced Ex Ash A Twelve. The "X" is spoken normally, the "Æ" sounds like "ash", and "A-Xii" reads out as "A twelve".
Why did they change the spelling from A-12 to A-Xii?
State regulations in California prohibit the use of numbers on legal birth certificates. Switching to Roman numerals allowed them to retain the meaning of the number 12 while complying with local vital statistics laws.
Do all of Musk's children have unusual names?
No. The children from his first marriage to Justine Wilson—such as Griffin, Damian, Saxon, and Kai—use traditional, historical, and standard Western names. The unconventional nomenclature is primarily concentrated among his younger children with Grimes and Shivon Zilis.
How many children does Elon Musk have in total?
Public records and family overviews list 14 publicly known children shared across multiple partners, including Justine Wilson, Grimes, and Shivon Zilis. Details on family life are regularly tracked by major publications like People.
