The data was already in the data sets under "old_name:de". If you need a source, I would be happy to refer to arcanum maps. I only want the names to be visible in the German version of openstreetmap, just like they are for all major towns and cities in Poland  (just like for Wrocław itself, where "name:de" is used). In Germany, the old names still have a relevance since the places are still known by those names in Germany (they are, for example, still officially used in ID cards and passports). 
Since "old_name:de" is not shown in openstreetmap.de but "name:de" is, I suggest we use this format then. The German names do not appartement in the international version of openstreetmap.org since they are not relevant internationally any more, but they appear in the German version, where they are still relevant today.