Elon Musk’s son is commonly known as X , and the full name was originally reported as X Æ A-12 , later rendered as X Æ A-Xii. Musk said it’s pronounced “X Ash A Twelve” ; many people shorten it to just “X.”

Pronunciation breakdown

  • X = “ex” or just the letter X.
  • Æ = “ash.”
  • A-12 = “A twelve.”

In plain English

So the most cited pronunciation is “X Ash A Twelve.”

Small note

There has been some variation in how Grimes and other outlets have explained it, but Musk’s own explanation is the one most often referenced.