It should be noted, however, that the increase in the proportion of surnames prefixed with Mc or Mac with latitude within
Scotland is not associated with an increase
in the prevalence of
multiple sclerosis." Yes, this was one of the crude methods they used to determine ancestry. A Mac or a Mc. They even call it crude themselves a couple of times. And still, they're not seen as having a higher rate as they rises proportionately in the population.