So, you want to change your name on Google Plus? You can easily change your Google+ profile name on Android, including first name, last name and nick name by doing as follows:
1. Open Google+ app on your Android device
2. Tap on your profile picture on the top left
3. Tap the 3dot icon on the top right
4. Tap on the Edit Name option
5. Change your first name and last name, and if you'd like the create a nickname or edit it, tap on "more options" and the field gets visible
Note that, changing your Google Plus name will change your name in the entire Google products.