Update your sending name on a mobile device
A sending name is the name your recipients see when you send email. Yahoo Mail uses one sending name per Yahoo ID.
Update from a computer
A sending name can only be changed from a desktop computer. Once your name is updated on a computer, it's also adjusted on your Yahoo Mail app. Change your sending name in Yahoo Mail.
Different sending name on your mobile device
Some third-party apps have their own sending name setting, which bypasses the Yahoo Mail setting. If the app you're using attaches a different name than the one saved in your Yahoo Mail settings, contact the manufacturer of the app for assistance.