Email

There are 3 forums here.  Your question posted in the PHONE section. No one will see it there.  Maybe one of the moderators will move your question to the INTERNET forum so you can get some help.  If that doesn't happen today, post it yourself in that forum. 

Helpers always want to know what type of email you are talking about.  Does this happen only when you send email from your desktop (POP) or does it happen when using Webmail?  

Have you checked the settings. If both of you are on the same account, you can only have one name on that address. Or i am misunderstanding your question. 

Are you talking about the signature at the bottom of the email text???

Sounds like its the display name thats wrong. What email program are you using? If Outlook, see this link here on help to change it.