Whether you just got a legal name change or simply want to switch up your nickname, it's easy to edit your name on Yahoo Mail.
Check out the products mentioned in this article: How to change your name on Yahoo Mail's mobile app 1.
Open the Yahoo Mail app and tap on your profile icon in the top-left corner.
Tap on the one you'd like to change and type in your new name.
Open up your preferred browser and log into Yahoo Mail, and then click the profile icon in the top right corner.