cubecolour

<p>WordPress 4.5 added the ability to login using the registered user’s email address in place of the username. When this plugin is active, the ability to login using the email address in place of the username is removed, and the label of the input field is changed to reflect this.</p>


No Login by Email Address

Removes the ability to login using the email address instead of the username.

Trân Minh-Quân

<p>This plugin lets you change user’s login username. It changes user_nicename as well so that your author link will correspond to your new username.</p>
<h3>Languages</h3>
<ul>
<li>English</li>
<li>Français</li>
<li>Swedish</li>
<li>Vietnamese</li>
</ul>
<h3>Credits</h3>
<p>Translators:</p>
<ul>
<li>Erik Billerby: Swedish</li>
<li>Igor Oliveira Ferreira: Brazillian Portuguese</li>
</ul>


WPVN – Username Changer

50% of the entire code circles around "level_can_use", i.e., role/level-based authorization, which has been deprecated many moons ago.
Additionally, it only allows to rename your own username.



Outdated & Limited

This plugin lets you change user's login username. It changes user_nicename as well so that your author link will correspond to your new username …

No Login by Email Address vs WPVN – Username Changer