title: Reading first name and last name of users from entity object in Drupal 8
body: <p>I can use getUsername() method to fetch username of a particular user (not current user) in Drupal 8 controller like following </p>
  
  <pre><code>        $other_id = $message-&gt;user_id ;
          $other_user_object = \Drupal\user\Entity\User::load($other_id );
          $name = $other_user_object -&gt;getUsername();
  </code></pre>
  
  <p>Here username is stored in my data_field table. getUsername() method allows me to fetch the data without mentioning table and column name. Now I want to fetch first_name and last_name of that particular user which are stored in users_data_more table. Is there any method in Drupal 8 to fetch the data? if not, how to fetch those data in Drupal 8 controller ? </p>