A couple of things you can check. First, open your contacts and see if this person is in your contacts. If so, delete the contacts. Next, go to Settings>Mail,Contacts,Calendars>My Info (in the Contacts section) and make sure you have selected the correct contact for youself. While you're there, check the Mail section to be sure you have Always Bcc Myself turned off. Then tap Default Account (if it's listed in the Mail section) and make sure you have selected iCloud as your default account. Finally, go to Settings>iCloud, turn Mail off, then turn Mail back on. This will delete, then add back your iCloud email account.
Then send another test email to yourself and see if anything changed.