how to determin a blog owners username?

I am trying to get a plugin author to make his plugin multisite compatible and there is a little problem I am hitting here: I'd like this plugin to use the blog owner's username in the FROM user field for emails sent and his email in the FROM email field.

the email part can be done: using admin_email but what to do about the username?

here is the whole thread in case you want to read the whole story: