If you are trading or will trade under a business name, you can register and list it in the Bizregister (link above).
This helps secure the name for trading, marketing, or general business purposes.
Apply for a business name certificate* here: businessname.co.za
If you would also like the option of registering for tax and receiving a sole proprietor certificate linked to the business name, apply here: soleproprietor.co.za
*Confirmation Notice of Defensive Name Registration