How to edit your account name and nickname in Yahoo?
Update your name to change your identity throughout Yahoo. Depending on the product, your name or nickname is at the top of the page. It may be visible to other Yahoo users. For example, your nickname appears next to the comments you make on Yahoo News.
Yahoo mail delivery name: the name in your outgoing email uses a different configuration.
Have you recently married, changed your name or do you simply want to reinvent yourself? Simply change the "From" or the shipping name shown to your recipients.