Names appear in the memory browser only if you have a PC and you have downgraded your compiler.
See the following documents on our website (Lessons tab). It was covered in some early screencast, forgot which one.
UpgradingTheCompiler_ForMacUsers
In my opinion, it is not worth the trouble to downgrade the compiler. First, you can only do it if you have a PC, second, all it gives you is that you can see the names of the variables in the memory browser. The cost is that you are using a very old compiler without the latest patches and updates.