The account name (as opposed to your username) is registered as the account owner in our internal database.
To change the name that your registrants will see, see this guide.
Step 1: Click the Account Settings icon on the menu to the left.
Step 2: Under Personal Information, click the blue Edit Profile button. Additional fields will appear where you can fill in various details of your account.
Step 3: Here you can edit various details of your account, including your First Name and Last Name. Make changes to any of these fields.
Step 4: Click Save.