To switch from a Gmail address to a non-Gmail address, you need to delete your Gmail address. Learn more about deleting your Gmail address. To switch from a non-Gmail address to a Gmail address, add Gmail to your account. Learn how to add Gmail to your account. If the email address you want is already an alternate email, remove it there first.
How to Recover a Forgot Gmail Username - Wondershare Apr 22, 2016 6 Gmail Username Ideas | Gmail Availability Gmail Availability Checker is a free tool to check if a Google Mail username is available. It instantly checks to let you know if a username is available as you type. It allows you to quickly and easily find the best Gmail email address.
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How to find my user name in Gmail - Quora Nov 12, 2019 Find My Account - Sign in - Google Accounts Find My Account - Sign in - Google Accounts Check for an existing account - Google Account Help