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
Brozzme and
WPServeur.