The Definitive Guide To 'X Musk Son': What Happened To X Æ A-12 And Who Is Techno Mechanicus?

The fascination surrounding Elon Musk’s children, particularly the one known as "X," remains one of the most compelling and unique stories in modern celebrity culture. As of December 18, 2025, the son initially named X Æ A-12, now legally X Æ A-Xii, continues to capture public attention due to his extraordinarily complex name and his appearances alongside his father, the CEO of Tesla and SpaceX. This article provides the most up-to-date profile on X Æ A-Xii and his siblings, delving into the meaning of their names and their private lives. The truth is, the search term "X Musk Son" primarily refers to X Æ A-Xii, the first son of Musk and musician Grimes (Claire Boucher), but a recent revelation has introduced another son with an equally unique name, making the Musk family tree a constantly evolving topic of discussion.

The Complete Profile of X Æ A-Xii Musk

The son of Elon Musk and Grimes is known to the world by a name that is part code, part phonetic puzzle, and part tribute to aviation history. His unique naming has made him an instant global figure, often simply referred to as "X" by his parents and the public.

• Full Name (Current Legal): X Æ A-Xii Musk
• Original Name: X Æ A-12
• Nickname: X
• Date of Birth: May 4, 2020
• Mother: Grimes (Claire Boucher)
• Father: Elon Musk
• Current Age (as of December 2025): 5 years old (approx.)
• Siblings (Full): Exa Dark Sideræl Musk ("Y") and Techno Mechanicus Musk ("Tau") (with Grimes); Nevada Alexander, Griffin, Vivian Jenna, Kai, Saxon, and Damian (with Justine Wilson); Strider and Azure (with Shivon Zilis).

The Mystery Behind the Name: X Æ A-Xii

The initial announcement of the name X Æ A-12 caused a global stir, prompting countless articles and social media debates on its pronunciation and legality. The name was quickly changed to X Æ A-Xii to comply with California law, which only permits Roman numerals in a name, not Arabic numerals. Grimes herself broke down the meaning of each component, revealing a profound, if esoteric, logic behind the choice:

• X: The unknown variable.
• Æ: The Elven spelling of AI (Artificial Intelligence) or "love."
• A-Xii: A tribute to the Lockheed A-12 Archangel, the CIA's reconnaissance plane, which is the precursor to the SR-71 Blackbird. The "A" also stands for "Archangel," her favorite song.

The name, pronounced roughly as "Ex Ash Twelve," is a clear reflection of his parents' shared interests in technology, science fiction, and non-traditional culture. This unconventional approach to naming has set a precedent for his younger siblings, ensuring the children of Grimes and Elon Musk will always be known for their unique appellations.

Life in the Spotlight: Public Appearances and Private Moments

Despite the intense public curiosity, X Æ A-Xii's life is largely kept private, though he has made a few notable public appearances that have provided rare glimpses into his childhood.

The Youngest Member of the Tesla Family

X has occasionally been seen accompanying his father to high-profile events. He famously appeared on his father’s shoulders at a major event in early 2024, a candid moment that was widely shared across social media. These rare, unscripted moments show the bond between father and son, often with X looking comfortable and curious in his father’s world of tech and business. Grimes has also shared small snippets of their life, particularly commenting on X’s development and personality. Ahead of his first birthday, she noted that he was already showing an interest in "radical art" and had an advanced understanding of complex concepts, a trait perhaps inherited from his visionary parents. These insights reinforce the image of X as a child being raised in a highly intellectual and unconventional environment.

The Nickname 'X' and Parental Dynamics

To simplify the famously complex name, X Æ A-Xii is almost exclusively referred to as "X." This short, powerful moniker has become his primary identity. The dynamic between his parents, Grimes and Elon Musk, remains a subject of public interest. Although their romantic relationship has been on-again, off-again, they have consistently stated their commitment to co-parenting their children. Recent reports have highlighted the challenges of their co-parenting arrangement, though they continue to navigate their relationship while raising X, Exa Dark Sideræl ("Y"), and Techno Mechanicus ("Tau").

The Other Sons of Elon Musk: From Twins to Techno Mechanicus

To fully understand the context of "X Musk Son," it is essential to look at the broader family, as Elon Musk is a father to a reported 14 children with four different mothers. The names of his other sons are equally compelling, especially the newest addition with Grimes.

Techno Mechanicus: The Secret Third Child with Grimes

In a major revelation from Walter Isaacson's 2023 biography of Elon Musk, the world learned about a third child between Musk and Grimes: a son named Techno Mechanicus. * Full Name: Techno Mechanicus Musk * Nickname: Tau The name Techno Mechanicus, often shortened to "Tau," aligns perfectly with the hyper-futuristic and technology-focused naming convention established by X Æ A-Xii and his sister, Exa Dark Sideræl (nicknamed "Y"). "Tau" is a Greek letter often used in physics and mathematics, while "Mechanicus" strongly suggests a theme of engineering and robotics—a fitting tribute to the Tesla and SpaceX founder. This "secret" third child adds another layer of intrigue to the already fascinating family dynamic, confirming that X Æ A-Xii is not the only son with a name rooted in science and futurism.

The Older Sons: Griffin, Kai, Saxon, and Damian

Before his children with Grimes, Musk had six children with his first wife, Canadian author Justine Wilson. The first, Nevada Alexander Musk, tragically died of SIDS at 10 weeks old. His other sons from this marriage include:

• Twins: Griffin Musk and Vivian Jenna Wilson (born 2004, now 20 years old). Vivian, originally named Xavier, transitioned and legally changed her name.
• Triplets: Kai Musk, Saxon Musk, and Damian Musk (born 2006, now 19 years old).

These sons, now young adults, have maintained a much lower profile than their younger half-siblings, though their lives and relationships with their father have been documented in various biographies and reports.

The Newest Reports: Romulus

In late 2024, reports surfaced suggesting that Elon Musk had a 14th child, a son named Romulus, with influencer Ashley St Clair. While these reports are less officially confirmed than the details revealed in Isaacson's biography, they underscore the continuous expansion of the Musk family and the public's insatiable curiosity about the names of his children. Ultimately, the term "X Musk Son" is a gateway to understanding the unique, modern family structure of one of the world's most influential figures. While X Æ A-Xii holds the title for the most famous name, he is part of a growing cohort of children whose names—from X to Techno Mechanicus—reflect a deep-seated fascination with the future, technology, and the unknown variable.

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