I recall there were three or four unregistered user with the same name on Math.SE. How can I confirm it? Is there anyway to search for the user? If one person is creating more than one unregistered account, is there anything we must do about it?
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As stated in Is there a way to sift through a list of unregistered users? and confirmed by @BenBrocka:
Google, however, will allow you to see a list of (all?) unregistered users, since their profile pages contain the string
I don't think so.
An unregistered user account consist basically of a cookie. If you delete your cookies, go incognito, change your browser, use another computer, format your hard drive, are inactive for too long, etc., you'll automatically create a new account when you come back.
Thus, forbidding somebody from creating several unregistered accounts means forcing that person to register. It's either allowed to use the site without registering or it isn't...
Of course, if there's some kind of foul play (i.e., interaction between the accounts), that something entirely different.