Exa Dark Sideræl Musk & Techno Mechanicus Musk (Kids)
In a 2022 Vanity Fair interview, Grimes revealed that she and Elon personally welcomed the baby girl through surrogacy.
“EXA is a reference to the supercomputing term EXAFLOPS (the ability to perform floating-point operations per second),” she said. “On the other hand, the darkness is unknown. People fear that, but it’s really the absence of photons. Dark matter is a beautiful mystery in our universe.”
Sideræl – pronounced “Sigh-Deer-ee-el” – nods “I choose to restrain the ring” according to Mama, “True Time in the Universe, Star Time, Deep Space Time, Relative Earth Time, and her favorite Lord of the Rings character, Galadriel.
Walter Isaacson revealed in his biography Elon Musk that Exa was born in December 2021 through Surrogate.
The book also states that around Father’s Day 2022, the only, only off-again couple welcomed a child called Techno Mechanicus, known as Tau via Surrogate. The biography includes a photo of Elon feeding the boy on the June 2022 date.
Although Grimes would prefer to keep other notable details private. “I tried to plead the public and my child’s dad to stay offline, and I shared it on social media in 2025.
