So I had my DNA analysed! I opted to have a 37 'markers' test which is meant to give you a very accurate comparison of your genes with those of someone else. The 'super test' goes up to 67 markers. As a result you are told your 'haplogroup' and what it means and you are told the names of the people who 'match' you. My haplogroup is R1b1c which apparently is the most common group of people in European populations. It is believed to have expanded throughout Europe as humans re-colonized after the last glacial maximum 10-12 thousand years ago. Surely I was going to find a DNA match? But no! Out of the tens of thousands of people who have been tested I do not (yet) have anyone who matches me exactly with 37 markers, nor even with 25 markers! I know that 6 MacHargue and one McHarg men have been tested, but not one of them appeared in my 'matches' - not even down to 12 markers!
Is this enough to say that there is no link between McIlhagga and McHarg and that the two names are definitely not related? Well, not quite. I am the only McIlhagga who has been tested and although I do not know of any breaks in my ancestral line - I don't know of any putative fathers - there may have been one, way back. The only way to progress this search is to have more McIlhaggas tested. Only results from a number of tests would endorse my views on the relation of the clan to the McHargs - or not! But who knows, will anyone else come forward to have their DNA analysed?