Delete email account from Android

1. Open your device’s Settings app.
2. Tap Accounts. If you don’t see “Accounts,” tap Users & accounts.
3. Tap the account you want to remove Remove account.
4. If this is the only Google Account on the device, you’ll need to enter your device’s pattern, PIN, or password for security.

The following link may be helpful if you encounter issues:

https://support.google.com/android/answer/7664951?hl=en