How to change contacts name in Whatsapp? I have a friend and I have added his real name in my Contacts. I want to put his nickname in Whatsapp simultaneously. I am using it in Android. How do I accomplish this?
You can follow these steps:


Rename the contact in your phone book and save.
Go to Settings > Account > whatsapp > sync now (or any similar option)
Check if this has worked.

TIP you can force close whatsapp and try.



If the above method doesn't work


Backup contacts
Go to edit contact of the one you wanna change.
Copy the number of that contact. 
Delete the contact.
Go to whatapp and refresh whatsapp contacts.
Add the contact number you copied with the desired name you want as a "new contact" in your address book.