Your workspaces can be easily renamed at any time. This can be done by an Administrator from the workspace settings. To access your workspace settings, click the gear icon just to the left of your workspace name once you have entered the workspace.
From here you can adjust numerous workspace settings, including the name.
Make the changes to the name you would like and click "Update Settings" when you are finished.
Note: Any activity previous to the name change will still reflect the old name in its contents. The link in the activity will still go to the correct workspace, however.