Go to the Google service where you linked the third-party site or app with your Google Account. For example, YouTube or the Google Assistant app. Select Connected accounts, Linked accounts, or Services. This may be in the Google service’s Settings section. Find the site or app that you want to unlink from your Google Account.
Check for an existing account - Google Account Help Verify your Google Account; Check for an existing account; Change your Google Account name & other info; Set up a recovery phone number or email address; Change the phone number on your account & how it's used; Change the email address for your account; Get a summary of data in your Google Account; How to download your Google data Google Account To edit the info that you use on Google services, like your name and photo, sign in to your account. You can also choose what personal info to show when you interact with others on Google services.
Check for an existing account - Google Account Help
How to find my Google account username - Quora Your user name, or the name that you use to log in / sign in, is your gmail address. If you didn't sign up for a Gmail address and you used a different email account Google Account When you sign in to your Google Account, you can see and manage your info, activity, security options and privacy preferences to make Google work better for you. You can review and adjust some privacy options now, and find even more controls if you sign in or create an account.
Aug 06, 2017
If your account has been breached, you will need to wipe your Android device and perform a clean installation. Afterward, you will need to change the password for your Google account used with the