On WhatsApp, here is how to change your display name
Many WhatsApp users do not know that they can change their display name. However, the changed display name will only appear for those who do not already have their personal information saved in their device. Let's have a look at how to change your display name on WhatsApp:
a. Open the WhatsApp application on your phone.
b. Tap on WhatsApp 'settings' in the bottom-right corner of the screen for iOS. For the Android users, tap the menu button and then tap on settings.
c. WhatsApp iOS users have to tap on their name at the top of the screen and the Android users have to tap their display picture.
d. Next tap on your current WhatsApp display name.
e. Then type the new name that you wish to display to your WhatsApp in-app contacts.
f. WhatsApp iOS users have to click on 'done' in the top-right corner of the screen, once the process is completed.