The X-Files: Everything You Need To Know About Elon Musk’s Son, X Æ A-Xii (Age, Name Change, And Pronunciation)

The mystery surrounding the most talked-about celebrity child name in history—X Æ A-12—continues to captivate the public, but the real story is even stranger than the original moniker. As of December 2025, Elon Musk and Grimes' eldest child, now legally known as X Æ A-Xii, is 5 years old, having celebrated his birthday on the iconic 'Star Wars Day.' The journey of his name, from its initial baffling announcement to a subtle, yet legally required, change, provides a fascinating glimpse into the lives of one of the world's most unconventional families. The continuous updates and public appearances of the child, often referred to simply as 'X,' keep him in the spotlight, prompting endless curiosity about his current age, his official name, and the true meaning behind the cryptic characters chosen by his billionaire father and avant-garde musician mother. This article breaks down the most recent, up-to-date facts about the child at the center of the global media frenzy.

The Complete Profile: X Æ A-Xii Musk Biography

The birth of X Æ A-12 (later X Æ A-Xii) instantly made global headlines, not just because of his high-profile parents, but because of his unique, seemingly unpronounceable name. The child's existence represents a fusion of technology, pop culture, and futuristic concepts, perfectly embodying the worldviews of both Elon Musk and Grimes.

• Full Legal Name (Current): X Æ A-Xii Musk (First name: X; Middle names: Æ A-Xii)
• Original Announced Name: X Æ A-12 Musk
• Nickname: X
• Date of Birth: May 4, 2020
• Current Age (December 2025): 5 years old
• Place of Birth: Los Angeles, California
• Father: Elon Musk (CEO of Tesla, SpaceX, X/Twitter, Neuralink, The Boring Company)
• Mother: Grimes (Claire Elise Boucher, Canadian musician, singer, and visual artist)
• Siblings: Exa Dark Sideræl Musk (known as 'Y' or 'Why?'), Techno Mechanicus (known as 'Tau'), and seven other half-siblings from his father's previous relationships (Nevada Alexander, Griffin, Vivian Jenna Wilson, Kai, Saxon, and Damian).

The Legal Name Change: Why X Æ A-12 Became X Æ A-Xii

The initial name, X Æ A-12, was a source of great confusion and amusement across the internet. However, a little-known fact is that the original name was not legally permissible under California state law.

California law dictates that names on a birth certificate must be composed of the 26 letters of the English alphabet, with the exception of hyphens and apostrophes. Numbers, like the '12' in the original name, are explicitly not allowed.

The parents, seeking to keep the spirit of the name intact, made a slight but crucial alteration. The numerical '12' was replaced with its Roman numeral equivalent, 'Xii.' This resulted in the official, legal name on the birth certificate: X Æ A-Xii Musk. The change ensured compliance while maintaining the name's unique, cryptic nature. Furthermore, the name is legally structured as 'X' as the first name, and 'Æ A-Xii' as the middle names.

Decoding the Name: Pronunciation and Meaning Explained

The name X Æ A-Xii is a linguistic puzzle, and even the parents have offered slightly different interpretations of how it should be said aloud, answering the constant curiosity of fans and media.

How to Pronounce X Æ A-Xii

There are two primary, accepted pronunciations, one from each parent:

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• Grimes' Pronunciation: "Ex-AI" (said like "Ex-Aye"). Grimes explained that the 'Æ' is pronounced like the letters 'A' and 'I' together.
• Elon Musk's Pronunciation: "Ex-Ash-Twelve." Musk clarified that the 'X' is spoken like the letter, and the 'Æ' is pronounced 'Ash.'

The most common and arguably the easiest way to refer to the child, however, is simply by his nickname, 'X.'

The Meaning Behind the Characters

Grimes took to social media to provide a detailed, futuristic breakdown of the name's components, revealing its deep connection to technology, aviation, and esotericism:

• X: Represents "the unknown variable."
• Æ: The "Elven spelling of AI," which stands for both 'Artificial Intelligence' and 'love.'
• A-Xii: This is a tribute to the Archangel A-12, which was the precursor to the SR-71 Blackbird, a legendary reconnaissance aircraft. Grimes described the A-12 as "our favourite aircraft. No weapons, no defenses, just speed. Great in battle, but non-violent."

The name, therefore, is a philosophical statement: an unknown variable of love and artificial intelligence, embodied by a non-violent, high-speed machine. This combination of concepts is a clear reflection of the parents' interests in technology, SpaceX, music, and a futuristic outlook.

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The Growing Musk Family and Siblings

X Æ A-Xii is not an only child; he is one of the many children of Elon Musk, a list that continues to expand and draw significant media attention.

X's closest siblings are those he shares with his mother, Grimes. His younger sister, Exa Dark Sideræl Musk, was born via surrogate in December 2021. Her name, equally complex, has also been informally changed by Grimes to 'Y' or 'Why?' or just the question mark symbol (?). The third child with Grimes, a son named Techno Mechanicus (nicknamed 'Tau'), was revealed in late 2023. This trio of children—X, Y, and Tau—form a fascinating, unique subset within the larger Musk family.

X Æ A-Xii also has several half-siblings from his father's previous relationships, including a set of twins, Griffin Musk and Vivian Jenna Wilson, and a set of triplets, Kai, Saxon, and Damian Musk, from his marriage to Justine Wilson. Additionally, Musk has had twins, Azure and Strider, with Neuralink executive Shivon Zilis, and a reported 14th child, Seldon, whose details remain largely private. The large, complex family structure ensures that X Æ A-Xii remains a central figure in the ongoing narrative of the Musk dynasty and the future of celebrity families.