Why do you want to remove a google account from an Android Phone, the most reason is that Google account you want to remove is not yours. It could be your spouse or a friend.
Why they account exist on your Android phone, the most likely scenario is your phone was using others SIM card for many reasons and they log in to Google from your phone.
Or without changing SIM card you were login using others Google login from the same phone.
This does not become a problem actually so far but there is something annoying. All their contacts/ friends become your friends too, it means your phonebook full of persons you do not really know. This is bad.
Caution: Don't mix up with delete Google Account, you don't want to do this as this will delete your Google account from your Android and your computer.
If that's the case, then follow steps below to remove other Google account from your Android phone and clear up unnecessary contacts.
|1. Tap gear account to go to settings|
|2. Tap other accounts|
|3. Tap Google|
|4. Tap account you want to remove|
|5. Slide to the bottom and tap remove account|
|6. note that upon account removal it will delete all messages, contacts and other data from the phone, tap Remove account|
|7. Make sure now you only have your google account on the phone|