Dennis, I think your description of the three branches of the Mumby's is somewhat misguided. Most people whose family claimed the name Mumby back in the 12th century or so, when surnames began to be used, did so because they or their ancestors originated in or around Mumby, or like the descendents of slaves were given the name by the holder of the land where they lived. They would not necessarily have been related at all. It is true that very few people can claim direct descent from the Norman Lord, or from a Viking called Mund (and the latter because records are so scant as to make proving this impossible) but then that could be true of any name connected with someone with an aristocratic past. It would be nice to think that we are all one big happy family, but the fact remains that although many of us may well be related, the vast majority bear no relationship to each other at all and never have.