The couple welcomed their first child together on Monday.
The Canadian musician Grimes, whose real name is Claire Elise Boucher, had explained the meaning of each character of her baby's name in a Tweet.
•X, the unknown variable ⚔️— ꧁ ༒ Gℜiꪔ⃕es ༒꧂ 🍓🐉🎀 小仙女 (@Grimezsz) May 6, 2020
•Æ, my elven spelling of Ai (love &/or Artificial intelligence)
•A-12 = precursor to SR-17 (our favorite aircraft). No weapons, no defenses, just speed. Great in battle, but non-violent 🤍
(A=Archangel, my favorite song)
(⚔️🐁 metal rat)
Musk has five other children, twins Griffin and Xavier and triplets Damian, Saxon and Kai from a previous marriage.