How do I have a email taken off my iCloud account. It’s not even my email address.

When Apple ID is signed in the iPhone the mail accounts ( of other person that was manually added ) Sign in with your Apple ID - Apple Support will be configured Add an email account to your iPhone, iPad, or iPod touch - Apple Support 

So the Apple ID has to be signed out Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support

Once again sign in with your Apple ID Sign in with your Apple ID - Apple Support

Set up iCloud Sign in to iCloud on all your devices - Apple Support , this time you have to add manually your mail account with mail address and its password , and not for other person mail address and its password .

Note : there is no such method to remove mail accounts manually when apple id is signed , however mail accounts can be configured using an iPhone .