SharePoint Configuration Wizard username problems. Confusing error message.

Can anyone shed light to my confusion?
The error says username should be the same as database access account, does it mean I will have a username vanillargk sqlexpress?

SharePoint Products and Technologies Configuration Wizard
The user name entered must be the same as the database access account for the server farm you wish to join. Either choose Sydneyrehmang as the username or choose a different database name.
Regards,
Jay
