Use them all. This will make it much easier for people to find the node. In the Info file, the file name, node name, and pointer names are all inserted on one line, which may run into the right edge of the window. Try to pick node names that differ from each other near the beginnings of their names. This way, it is easy to use automatic name completion in Info.
Duplicates confuse the Info movement commands.
This means, for example, that if you end every chapter with a summary, you must name each summary node differently. You may, however, duplicate the titles of chapters, sections, and the like. A pointer name must be the name of a node. The node to which a pointer points may come before or after the node containing the pointer. Specify the file name in parentheses.