So much for creative expression! It seems that, despite what celebrities may say, you can't name your newborn child anything you want, especially in the state of California. Elon Musk and Grimes may have learned that the hard way.

The Tesla CEO and the Canadian singer welcomed their newborn baby boy on May 4, revealing to the world that their son's name is apparently X Æ A-12.

Well, so they planned, anyway.

We're not sure how that would have been pronounced but it actually sounds like they're not allowed to add it to their baby's birth certificate thanks to the strict naming laws in the state of California. X Æ A-12 is believed to have been born in LA, per TMZ.

According to People, family law attorney David Glass explained that even though the name itself isn't actually illegal, the state won't accept it.

"In California, you can only use the '26 characters' of the English language in your baby name," said Glass.

In fact, you used to not even be able to include "diacritical marks" either.

Those mostly include accents like tildes and umlauts on letters, which were also banned until a 2017 amendment made them permissible.

However, characters from other alphabets, as well as numbers and symbols, are still prohibited.

So, it would seem that there goes the X Æ A-12 idea, as that amendment still wouldn't seem to cover the hyphen, the number 12, or the Latin letter Æ in the name.

Glass did note that Musk and Grimes may be able to appeal to have their son's name permitted, but it's unlikely they will succeed "because, again, California... has been struggling with using symbols."

The name caused an immediate stir when it was revealed by Musk on May 4. Grimes later shared the meaning behind the choice.

"X, the unknown variable, 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)," reads her explanation

But even the mom herself got confused and caught up in the moment after misspelling the aircraft which her son was named after.

"SR-71, but yes," replied the Tesla CEO to his partner.

The duo, who have been together for the last two years after connecting on Twitter, are known to be anything but ordinary.

Now it seems that, with this barrier in the way, the couple will have to find a new name to give their child.

If their son was indeed born in Cali, may we suggest something with fewer symbols?