iOS keyboard suggests an old email address
iOS gets your email addresses and other accounts from two places. The first place is your Contact Card in Contacts. The second is from your Accounts and Passwords settings in the Settings app. In your specific case, go to your Contact card and see if the email with the label "email" is there. If so then iOS got it from there. You can also check in Settings under the Accounts and Passwords section. These are the only two places it could have come from (maybe iCloud Keychain but probably not). Hope this helps!