Outlook.com email display name

I have an email account with hotmail. I recently changed from hotmail to outlook.com. When i registered it, I gave my name for email display name wrongly ie(DAN KM (dan@****)). Now when I try to change my display name for email from DAN KM to DAN CHETTY, its not working. I went to profile and changed my account name. But its not taking any change while I send email to others. It still shows the same old name.

Kindly assist me on how the change the email display name. 

Thanks.