I am also a "Seth", but from overseas and have often asked "where do all the Seth's come from?". There seem to be so many seth's and from all over. You mention that all are related (in your area). My question is where is the source of the seth's. I'm from England (Britain) and know of relatives in Australia, but nothing more. Have you any ideas of the source?
Even if you don't it is fascinating to read about all the seth's around the world.