I would add the following to this discussion. I have a cousin (not with my surname) who lived in Gretton, Northamptonshire who his called house "Craxford House" because the maiden name of both his grandmothers was Craxford (they were first cousins once removed). The house and sign are still there. Consanguineous marriage is far commoner than expected, particulalry in rural communities.
I was in conversion with a Professor of Social Anthropology in the US who made the following observation: "In a population of between three and five hundred people, after six generations or so there are only third cousins or closer to marry. During most of human history, people have lived in small, isolated communities of about that size, and have in fact probably been closer to the genetic equivalent of first cousins, because of their multiple consanguinity. In nineteenth-century rural England, for instance, the radius of the average isolate, or pool of potential spouses, was about five miles, which was the distance a man could comfortably walk twice on his day off, when he went courting- his roaming area by daylight. The bicycle extended the radius to twenty five miles. "**
Alan
** Shoumatoff, Alex: The Mountain of Names: A history of the human Family with introduction by Robin Fox; Kodansha International, New York, USA (1995). ISBN 1-56836-071-1