Does anyone know how to override the layer names output by ArcGIS, where the output layer is called Other, or . These usually refer to things like the map border, labels and the background.
The current answer to this appears to be "No" but there is an ArcGIS Idea called Exporting maps into GeoPDF format which mentions that:
it's impossible to rename layers, once the pdf is created, all graphic symbols are combined into a layer named "other1, 2, 3, etc" by default, the legend and the map frame become a layer and we don't have the option to rename these.
That would appear to be the best place to cast an ArcGIS Ideas vote for the functionality you seek to be added to ArcGIS for Desktop.