match name upon signup

Hi all, I've recently started using the buddypress profile groups to allow a quick and painless signup for new members (I'm using the pop-over form that comes with the membership plugin).

Most of my members now don't have their name displayed publicly at all and all new members don't have their names displayed publicly (as in 'howdy name').

How can I keep the two buddypress profile groups but match the name upon signup and for the existing community members?