Changing the text in the website tab

I have comments plus setup on a subsite in a multisite install. The first tab, the WordPress one, gets overwritten by the name of the subsite. However, my multisite is integrated so I want it to display the name of my multisite in all instance when a user is not logged in (when a user is logged in, it shows their username - this is good).

How do I change the displayed website name on the first tab?