If you send email as different addresses, then you are used to seeing the From field in messages that you compose. The way your name appears to you in the From field is specific to your configuration of Outlook and does not affect how your name or return email address appears to other people who receive email from you.
If you would like to configure how your name appears to you in the From field, follow the steps below. You will need to do this on each computer where you use Outlook, since this a client side setting.