Our first Ireland McGurk received so many matches.   It turns out this is some kind of Ireland Island Effect.  Any male and his ancestors who haven't moved from the island of Ireland seem to match with many other males still in Ireland as well.  Most of their American counterparts, however, even with only 3-4 generations in the US, seem to have easily mutated away from this group, no longer affected by the Effect.  This gives us a clearer picture of true and unique connectedness if there is indeed a match :D