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5 Shocking Facts About X Æ A-XII: Elon Musk’s Son's True Age, Name Change, And The Secret Meaning

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The highly unconventional name of Elon Musk and Grimes’ first child, X Æ A-12, instantly became a global phenomenon, sparking endless curiosity about its pronunciation, meaning, and the child's identity. As of the current date in December 2025, the child, now legally named X Æ A-XII, is 5 years old and continues to be one of the most talked-about celebrity children in the world. The initial name, which had to be legally adjusted, holds a deeply symbolic meaning rooted in the parents' shared interests in technology, aviation, and artificial intelligence.

This article provides the most current and comprehensive details on X Æ A-XII, including his exact age, the reason for the name change, a breakdown of its cryptic components, and the full context of the Musk-Grimes family dynamic.

The Complete Biography of X Æ A-XII and His Parents

X Æ A-XII is one of the most famous children in the world due to his unique name and high-profile parents. His life is intertwined with the complex family structures of both his father, the billionaire entrepreneur, and his mother, the avant-garde musician.

X Æ A-XII (Commonly known as 'X')

  • Full Legal Name: X Æ A-XII Musk (Originally X Æ A-12 Musk)
  • Date of Birth: May 4, 2020
  • Current Age (December 2025): 5 years old
  • Place of Birth: Los Angeles, California
  • Parents: Elon Musk and Grimes (Claire Boucher)
  • Siblings (from the same parents): Exa Dark Sideræl Musk ('Y') and Techno Mechanicus Musk ('Tau')
  • Pronunciation: According to Grimes, it is pronounced like "X A.I. Archangel" or simply "X."

Parental Biographies: Elon Musk and Grimes

  • Elon Musk (Father):
    • Full Name: Elon Reeve Musk
    • Date of Birth: June 28, 1971
    • Occupation: CEO of SpaceX, CEO of Tesla, Owner/CTO of X (formerly Twitter), Founder of The Boring Company, and Co-founder of Neuralink.
    • Total Children: Known to be the father of at least 14 children with four different women.
  • Grimes (Mother):
    • Full Name: Claire Elise Boucher
    • Date of Birth: March 17, 1988
    • Occupation: Canadian Musician, Singer, Songwriter, Record Producer, and Visual Artist.
    • Musical Style: Known for her unique blend of dream pop, synth-pop, electronic music, and R&B.

Fact 1: The Current Age and The Name That Had to Change

The first question most people ask is about the child's age. Born on May 4, 2020, X Æ A-XII is currently 5 years old as of December 2025. He will celebrate his sixth birthday in the spring of 2026.

The second most significant detail is the name change. The original name, X Æ A-12, was announced shortly after his birth. However, due to the unique strictures of California law, which only permits the 26 letters of the English alphabet in a legal name, the number "12" was not allowed.

To comply with the law while retaining the spirit of the name, the parents officially changed the "12" to the Roman numerals "XII." This resulted in the final, legal name: X Æ A-XII Musk. Despite the change, the parents and the media often refer to him simply as "X."

The name change highlights the challenge of balancing personal, futuristic vision with legal and bureaucratic realities. The use of Roman numerals was a clever workaround to keep the numerical component's meaning intact.

Fact 2: Decoding the Cryptic Meaning of X Æ A-XII

The name X Æ A-XII is not a random collection of characters; it is a meticulously crafted, highly symbolic message explained by Grimes herself. Each component reflects the parents' fascination with technology, pop culture, and theoretical concepts.

X: The Unknown Variable

According to Grimes, the "X" stands for the "unknown variable." This is a nod to mathematics and the concept of the unknown, a foundational element in scientific and philosophical inquiry. It also serves as the child's simple, easy-to-use nickname.

Æ: The Elven Spelling of AI

The character "Æ" is a ligature (a combination of 'A' and 'E') and is pronounced "Ash." Grimes clarified that it is the "elven spelling" of "AI," which stands for both "Artificial Intelligence" and "love" in a few different languages. This element perfectly encapsulates the mother's artistic and futuristic sensibilities.

A-XII: Archangel and the Blackbird

The final component, A-XII, replaces the original A-12. This is arguably the most specific element, referencing the Lockheed A-12 Archangel, which was the precursor to the SR-71 Blackbird. Grimes described the A-12 as her and Elon’s favorite aircraft, calling it "greatest plane ever" for its lack of weapons and incredible speed.

  • A-12: Reference to the Archangel-12 reconnaissance aircraft.
  • Archangel: The name Archangel is also the title of Grimes' favorite song.

In essence, the name translates to: "Unknown Variable" + "Artificial Intelligence/Love" + "Archangel/Blackbird."

Fact 3: X is Not an Only Child—Meet Exa and Techno

While X Æ A-XII often dominates the headlines, he is not the only child shared by Elon Musk and Grimes. The couple has two younger children who also bear famously unique names, further demonstrating the parents' commitment to unconventional naming conventions.

Exa Dark Sideræl Musk ('Y')

Born via surrogate in December 2021, Exa Dark Sideræl is the couple's second child and only daughter. She is commonly nicknamed 'Y' to match her older brother's moniker, 'X'.

  • Exa: A reference to the supercomputing term "ExaFLOPS."
  • Dark: Represents "the unknown."
  • Sideræl: An "elven" spelling of sidereal, meaning relating to the distant stars.

Techno Mechanicus Musk ('Tau')

In late 2023, the existence of a third child between Musk and Grimes was revealed, a son named Techno Mechanicus, who goes by the nickname 'Tau'. This name continues the theme of technology and science, making the three siblings—X, Y, and Tau—a trio of futuristic monikers.

The existence of these three children solidifies the Musk-Grimes family unit as one of the most intriguing and forward-thinking in the public eye, constantly generating interest and discussion about the future of naming and parenthood.

elon musk child x æ a-12 age
elon musk child x æ a-12 age

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