Married people with different names is not a problem: you list all of the names on the name shield. This is also common with WGs (shared accomodation). The co

Married people with different names is not a problem: you list all of the names on the name shield. This is also common with WGs (shared accomodation). The common case that fails badly is where two people in the same apartment block share the same surname. There is no good workaround for this case, especially given the German resistance to putting first names in formal correspondence.