Jan, Your problem sounds a lot like mine. As I've been searching I came across some books to check at the FHL. I haven't looked for them yet but maybe somebody else out there has. They are: Bahlow's Nammenlexikon and Hamburg - Police Records of Passport Applications in German it's Reisepass Protokolle (1851 -1929). In the lexicon you can find the location of surnames if I understand it correctly. Hope this helps. Ann