Register Your Business Name
If you are thinking of starting a sole proprietorship you will need to register your business name with the Canada Revenue Agency to check if someone else is already using it. This link will help you get started: Register a business name.
Remember, if you are using a business name other than your own personal name, be sure to check if someone else is already using it. Business Name Search There is a fee for this service so be sure to have your credit card ready