You can customize how your name appears throughout your workspace. To edit your name, click on your avatar in the bottom left corner and choose My profile from the menu.
Enter your preferred name under Full name and click the Save changes button at the top of the page.
You can also add a company name and title. Just be sure to click the Save changes button at the top of the page any time you make a change.
The company name in My profile refers to the company you are personally tied to, not the name of the company using the workspace.