Signing into iTunes store pop-ups (random email addresses)

Just got the iPhone X, and every few minutes I get a barrage of 'Sign In to iTunes Store' pop-ups, but there's a catch - the email listed isn't my email. Let's say my email is ABC123@gmail. This is asking me to sign in with RJReich@gmail and HeartofSilver@gmail. I don't know who these emails belong to. Never seen them in my entire life. I've tried browsing through the settings to delete any trace of these emails, of course to no avail. It's ruining my 'new phone' experience.