Your name is your name, and no piece of paper can grant it or take it away.
If the world of HPMOR is some sort of simulation, as you claim, then this is true and significant; your name exists as a fixed value that can be referenced by a program like the Map. But if the world of HPMOR is more like our own, then to say "your name is your name" is pretty empty; like most everything else, there is an explanation of why your name is your name. In our world, what makes it true that we bear the names we do is not that we all have own values for the variable $name. Rather, what makes it true is some other fact; one possibility (one that I don't believe myself) is that what makes it true that my name is Alex is the fact that my birth certificate reads 'Alex'.
So I think our disagreement arises from what we think the world of HPMOR is like.
If the world of HPMOR is some sort of simulation, as you claim, then this is true and significant; your name exists as a fixed value that can be referenced by a program like the Map.
I think these are two separate issues.
One issue is concerned with the wizards' concept of names. The wizards who created the Map would seek to imbue it with whatever naming convention felt right to them.
The other issue is concerned with how the HP:MoR universe works, and which resources the Map can tap in order to implement its functionality.
These issues are somewhat relate...
The new thread, discussion 13, is here.
This is a new thread to discuss Eliezer Yudkowsky's Harry Potter and the Methods of Rationality and anything related to it. With three chapters recently the previous thread has very quickly reached 1000 comments. The latest chapter as of 25th March 2012 is Ch 80.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author's Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six, seven, eight, nine, ten, eleven.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: