Benoti

Brozzme Change Username is a one click tool to modify any user username everywhere.
To apply a new name, you just need to to select an user and put its new username. 
This plugin will detet any user_login with an “admin” sequence. It will secure your WordPress from bots that will try to access to your WordPress back-office. 
This plugin doesn’t have any options settings.
Link to <a href="https://brozzme.com/" title="Brozzme" rel="nofollow ugc">Brozzme</a> and <a href="https://www.wpserveur.net/?refwps=221" title="WPServeur WordPress Hosting" rel="nofollow ugc">WPServeur</a>.

Brozzme Change Username

Easily change a WordPress Username, save time, increase security.

nafsadh

Validate Profile Credentials and Names
In a WordPress site users have multiple names in their profile, the user login, display name and nick name. In a multi-user site, there is often a need to keep them unique. You need to allow users have only credible names, such that,
<ul>
<li>All display names are unique</li>
<li>All nicknames are unique</li>
<li>No nickname is a display name or login name of another user</li>
<li>No display name is a nickname or login name of another user</li>
</ul>
Credible Names is a easy plugin to help you with that.

Credible Names

Ensure user's nickname and display name are unique and not a display name or nick name or user name of someone else

Brozzme Change Username vs Credible Names