Your WordPress username is something that is specific to your individual WordPress installation. You may, however, find this information within your WordPress database. To do so, open your database that contains your WordPress installation using <a href="http://www.inmotionhosting.com/support/website/database-setup/how-do-i-manage-a-mysql-database-in-phpmyadmin-in-my-control-panel-cpanel">PHPMyAdmin</a>. Then, locate the users table. Here, you will see a list of all users that are within the installation. Using this table, you can locate your WordPress user or even <a href="http://www.inmotionhosting.com/support/website/wordpress/resetting-your-wordpress-admin-password">update the WordPress password</a> if you need to as well.