Force the "display_name" of all users to be the user's first and last name. If those fields are empty, display name falls back to their
BuddyPress Real Names allows you to change the regular nickname displayed for a user to anything you want.
Enhance your Registration Page. Require First Name, Last Name. Add custom fields. Require custom fields.
Require first and last name from users who are editing their profiles.
Adds First name and Last name to registration form.