This is a common technique in the mailing list industry. It's called "salting". You add fake names, but real email addresses, street addresses, or post office boxes. You then monitor what shows up in these places addressed to "Mr. Fake Name". It's how mailing list companies monitor who is using their lists and helps control misuse.
A general term for this is a "copyright trap" [1]. Map makers for example often add small, fake features to be able to tell if another map was copied from theirs.
