title: Laravel, Check if name of user exist on original laravel auth
body: <p>I have laravel application! I use original laravel authentication from </p>
  
  <blockquote>
    <p>php artisan make:auth</p>
  </blockquote>
  
  <p>My question is how to check if name already exist in database and if exist to return error message!</p>
  
  <p>My user table structure is:-</p>
  
  <pre><code>user: 
   id - UNIQUE 
   name 
   email  
   password  
   remembertoken  
   timestamps
  </code></pre>