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Elon Musk and Grimes’ Children: Exa Dark Sideræl and Techno Mechanicus
Entrepreneur Elon Musk and musician Grimes have previously disclosed the names of their children, Exa Dark Sideræl Musk and Techno Mechanicus Musk, revealing unique origins behind these unconventional choices. News initially emerged in a 2022 Vanity Fair interview where Grimes shared the arrival of their daughter, Exa Dark Sideræl, via surrogacy.
The Meaning Behind Exa Dark Sideræl’s Name
Grimes explained that the name “Exa” pays homage to “exaFLOPS,” a supercomputing term denoting the capacity to perform 1 quintillion floating-point operations per second. She further elaborated on “Dark,” stating it represents “the unknown. People fear it, but truly it’s the absence of photons. Dark matter is the beautiful mystery of our universe.”
Sideræl: A Cosmic and Literary Reference
The name “Sideræl,” pronounced “sigh-deer-ee-el,” carries a more abstract meaning. According to Grimes, it signifies “the true time of the universe, star time, deep space time, not our relative earth time.” Additionally, it serves as a tribute to Galadriel, her beloved character from Lord of the Rings, who “chooses to abdicate the ring.”
Techno Mechanicus and Confirmation of Birth Details
Details surrounding the children’s births were further clarified in Walter Isaacson’s biography, Elon Musk. The biography confirmed Exa Dark Sideræl’s birth in December 2021 via surrogate. Furthermore, it unveiled the arrival of their son, Techno Mechanicus, nicknamed Tau, around Father’s Day in June 2022, also through surrogacy. The book included a photograph from June 2022 showing Elon Musk feeding baby Tau.
Grimes’ Concerns Regarding Children’s Privacy
Despite publicly sharing these details, Grimes has expressed a strong desire to maintain her children’s privacy. In social media posts from 2025, she conveyed her anxieties about their public profiles. “I have tried begging the public and my kids dad to keep them offline, and I’ve tried legal recourse,” she stated. “The state of my children’s lives being public is of grave concern to me and I think about how to solve this every day. It’s insane to me that there’s no way to deal with this.”
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