Confusion In Company Name And Brand Name To Use In Appointment Letter

Hiiiii eveyone, I have a company with different name and brand name is different so how can i show the brand name in appointment letter...please help

Dear Sakshi,
Does the brand name belongs to the same company ? if yes , then show the brand name at the header of the letter and mention the company name somewhere else in the same letter because the idea behind creating a brand name is to make the company popular by way of using the brand name.
For instance:
Fastrack is a brand name which belongs to Titan.
Piyush Raj Verma
Founder & CEO
Yellow Kagaz Business Solutions

Company is the entity giving employment and should be noticeable prominently in the appointment letter.
brand name if you feel is necessary to feature in appointment letter can be featured on the side or in the letter itself-X company owns -so and so brand -which is famous for --quality etc.