Again, super duper not a lawyer, but my understanding is that everyone has copyright protection over their own voice/face/name.

It’s not like a trademark, which you have to file for. It’s assumed protection.

Edit: after some quick googling, I think it’s inaccurate to call this “copyright” — “personality rights” or “publicity laws” are probably what protect people in this case? But overall, yes, appropriating someone else’s name, image, or likeness is illegal.