Final answer:
CJ said they had to change the name 'Three Amigos' due to it being a registered trademark and the potential legal consequences of using it without permission.
Step-by-step explanation:
CJ said they had to change the name 'Three Amigos' because it was already a registered trademark. Use of a registered trademark without permission can lead to legal issues and potential lawsuits. Changing the name was a necessary step to avoid any legal complications and ensure that they were not infringing on someone else's intellectual property.