BuddyPress.org

Regarding my last comment on my question #3, I was browsing the BuddyPress plugins list and found this but unfortunately, the link (https://buddypress.org/community/groups/buddypress-real-names/) goes to a different plugin’s page.:

BuddyPress Real Names
BuddyPress Real Names is a BuddyPress plugin that use two different fields (one for the last name and one for the first name) to display the Full Name instead of the regular name field. If you have already a community with members; you can use it to replace all the old names with Full Names. […] ..