I would guess that Christian name and Surname are two custom User Profile Fields you have? There is no option to compare two profile fields and, if they are the same, ban the user. You would need to write a plugin to do that. And, since you are already using a hack that interacts with registration, you may need to add it to the end of one of those plugins. You may want to post in the modification thread and ask which of the plugins would be the best to add your code to.
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