There are certainly racial characteristics peculiar to some societies, an abnormality in blood corpuscles where they become too thick being prevalent in people of Irish descent. I am not so sure about the length of toes being a reliable indicator though and, as for red hair, it may well have come about as an adaptation to life in northern, less sunnier climes. I must say I do seem to match all the criteria but then I know that from the 1600's at least my forebears have all come exclusively from the Celtic fringes of the UK so perhaps it is not surprising.