Amy Green

Login errors in WordPress can be used by hackers to guess whether they entered wrong username or password.
This is a lightweight plugin that will hide those login errors and make your WordPress login more secure.
Features: 
* No annoying settings to deal with. 
* Install and automatically hide login errors. 
* Lightweight with only a few lines of code.

Hide Login Errors

Login errors in WordPress can be used by hackers to guess whether they entered wrong username or password.

r-a-y

This plugin overrides display names across your BuddyPress site with usernames. The plugin will make your BP install more intuitive and user-friendly when using the @mentions feature.
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BuddyPress Usernames Only

Override display names across your BuddyPress site with usernames.

Hide Login Errors vs BuddyPress Usernames Only