EMERGENCY Please help, my son is in trouble?

My 14 year old son wants to legally change his name from Karl to "Cash-Money God". I don't understand the meaning behind it, we are well off but still. I understand why, I changed my name a few years ago to Super-King but thats awesome and bada s s. And his older brother changed his name to Max Overdrive which ic pretty good. Should I let him do as he wants?