This is one of the frustrating problem in outlook, having an incorrect display name in your email which might lead to inconvinience in your part if you do sent sensitive email to unintended recipient . Specially to the organization like us who’s managers are moving around, it is important that you correct the display name of your outlook to avoid confusion when you receive or about to send your email. Here is the quick fix.
Click your contact list.
Make sure your view is as a list.
Search your contact to edit.
Edit the “DISPLAY AS” & Save