Go to your Google Account. On the left navigation panel, select Security . On the Your devices panel, select Manage all devices. You'll see devices where you're currently signed in to your Google Account or have been in the last few weeks.

Simply open your browser. And type the person's name + email address. You can also try the following queries: “Firstname lastname” + “@gmail.com”

On your Android phone or tablet, open the Gmail app . In the top right, tap your profile picture. Tap Add another account. Choose the type of account you want to add.

To find all your Gmail accounts or Google accounts, you can follow these steps: Open a web browser and go to the Google Account Recovery page (https://accounts.google.com/signin/recovery). On the account recovery page, enter the email address or phone number associated with your Google accounts and click "Next."