Gera is a town south of Leipzig, (which is south of and not all that far from Berlin.) Gera can also be a family name in Slovakia, southern Poland, perhaps Bohemia and Moravia, as well as in Germany. Not clear to me whether the German Gera's are ethnic Slavs, or whether the Gera's in Slovakia and other Slavic regions are ethnic Germans. Reuhs is a family name (not a common one) in Germany and sometimes further east. It is sometimes but not always a Jewish name (ditto Gera) which, sadly, probably explains why neither name is common in that part of the world.
Neat drilling, by the way.
