For alias generation I believe. It might sound strange but I also wondered about it (the codebase is 3.5MB in size, there is some dead code left over in there and I don't know every detail about every field anymore (code docs don't contain every detail about every field). I weeded out dead code in the last month but I might overlooked this value.
I suggest you ignore FriendlyName.
/me adds 'FriendlyName' to list of code to remove.