The name on the first page of the wiki will be taken from this field.

If there is one wiki for the entire class, when the first student enters the wiki, that student will see the starting page(s). If that first student edits any page, the next student who enters will see the edited version, and so on. If there is one wiki for each group in the class, then each group will get a fresh wiki with the starting page(s) that you created. Also, if each student gets their own wiki, each student will see their starting pages when they enter their wiki.