Ensure user's nickname and display name are unique and not a display name or nick name or user name of someone else
SX User Name Security prevents WordPress from showing your real Login by overriding the body_class function, User Nicename, Nickname and Display Name.
Secures your wp site from hackers by hiding username of members from front side.
A simple plugin to change registered usernames.
Ajax powered admin page to show, edit, add, and remove user meta. Choose dropdown list by User Login, ID, or Display Name.
BuddyPress Real Names allows you to change the regular nickname displayed for a user to anything you want.
This Plugin passes an alternate image to gravatar.com that generates the user's display_name if they do not yet have a gravatar.