Use the full name instead of the user name as author of articles
There's a module for that - RealName


  The RealName module allows the administrator to choose fields from the user profile that will be used to add a "real name" element (method) to a user object. Hook_user is used to automatically add this to any user object that is loaded. It will also optionally set all nodes and comments to show this name.


EDIT - since your new to Drupal you might want to checkout - http://drupalmodules.com/ - great way of finding modules that you might need.