FYI @jerry0, @Jared_Needell , one (not so good) work around is to delete the “Name” field for all users and hide that field. If a topic creator has their name filled out in their preferences, the email from name will be the topic creators name. If the topic creators name field in their preferences is not filled out, the from name will be the name of the site. See the following thread for more info on a related issue I found:
https://meta.discourse.org/t/possible-bug-or-misunderstanding-about-topic-invitations/90710