To display your full name, edit your name in Account Settings. On the Tools menu, click Account Settings. On the E-mail tab, select your Internet service provider (ISP) account, and then click Change. Under User Information, in the Your Name box, type your name the way you want it to appear to people who receive email messages from you.
How To Change Display Name
How To Change Display Name In Hotmail Password
Not sure what section this best fits but has anyone ever had issues with their hotmail/outlook acc whereby their display name randomly changed? At work today I got emailed by my wife who has hotmail. My work client is outlook and i was baffled when the display name of her email was suddenly 'ClaimsTax UK'??? Totally baffled. When we logged into her account via browser her display name was set as this. Not something we would ever have done ourselves. I have edited it in the account profile back to her name but this is a concern. Does this sound like hacking or maybe MS getting into a pickle. I know outlook.com has had some issues in the past too but never seen anything like this before!