I can't change the sender/receiver name on my email

This seems like a simple problem, but I can't solve it. On my email, I send a message and it shows my wife's name as sender on the recipient's received email. I thought it was caused by my wife's entry in the Address Book showing our email address, so I deleted her entry from the Address Book, but it didn't remove the problem. I see no other connection of my wife to my email account so I cannot figure out how to have my name show as sender on my emails. Any suggestions?