If you do not know you gmail account and password how do
What do you do if you are not currently using the Apple ID and password to unlock the watch with Apple Watch locked owner
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See if you can recover the ID/password. An iCloud e-mail address is an Apple ID. Use every email address you can think of.
Apple ID - How to find your Apple -
Other ways to find your Apple ID
You can check to see if you're signed in to the App Store, FaceTime, or Messages on your iPhone, iPad, iPod touch, or Mac, or check to see if you're signed in to iTunes for Windows on a PC. You can also go to iCloud.com or appleid.apple.com and see if your Apple ID prefills on the sign-in screen.
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.