Just when you thought having the name X Æ A-12 couldn't get any tougher to pronounce, along come your parents to make it a whole new level of impossible altogether.

Announcing the name change on social media this past weekend, singer Grimes and entrepreneur Elon Musk have had to change their newborn son's name to adhere with the state of California's strict guidelines that a child must only have the letters from the alphabet as their name - no numbers allowed.

Taking this on board, Grimes and Elon Musk have changed their son's name from X Æ A-12 to X Æ A-Xii, including Roman numerals in their son's name.

Grimes said of the change on her Instagram account: "Roman numerals. Looks better tbh ... one dash is allowed."

Matt Conens, of the Office of Public Affairs of the California Department of Public Health, wrote in an email to USA Today: "Vital records must be completed with the 26 alphabetical characters of the English language and appropriate punctuation such as hyphens, apostrophes, periods, and commas."

Well, now that that's been cleared up, and we now know how the couple pronounce the name (either by calling him "X" or "Ash"), the name was also explained to us after the child was born on May 4. Explaining the thought-process behind their newborn son's name earlier this month, Grimes and Elon Musk took to Twitter to tell the world how they came up with the name.