Elon Musk and Grimes welcomed their second baby through surrogacy. The name of their second child which is a girl is Y. In May 2020 Elon Musk and his girlfriend Grimes had their first child, a boy called X AE A-12, or X for short.
Speaking in an interview with Vanity Fair, Grimes didn’t share many details about her second child Y but did say “Her full name is Exa Dark Siderael Musk”.
Exa obviously means exaFLOPS, which is a supercomputing term that refers to systems that can work out “one quintillion floating operations per second”.
Grimes explained that Dark is a reference to “the unknown”.
“People fear it but, truly, it’s the absence of photons,” she said. “Dark matter is the beautiful mystery of our universe.”
Siderael, meanwhile, is a reference to “the true time of the universe… not our relative earth time”, and is a nod to her favourite Lord Of The Rings character, Galadriel, a royal elf who “chooses to abdicate the ring”.