I was only speaking about sidewalks, not paths generally.

According to wiki on names of sidewalks: "There is no consensus on whether this is necessary, and regional customs differ."  Hungary has a long standing practice of not adding names to sidewalks.

I see and understand your points, but it would require a huge job to add a name to all sidewalks in Hungary. I think renderers, route listers should figure out the names of sidewalk. Adding the duplicate name could be mapping for the renderer. 

And it's not just Hungary, Worldwide only 4% of sidewalks has a name, check taginfo: https://taginfo.openstreetmap.org/tags/footway=sidewalk#combinations