If your ancestors lived up in the Irish interior, they probably gave you r1b Briton. If they were down near the coast, the probability of your haplotype being Germanic/Scandinavian is much higher. It's in the literature. Anyway, you have to have this test done on Y-DNA, which means finding a male blood relative to give the sample. mtDNA will not do. What's more interesting is; why did the Irish and Welsh speak such different versions of a Celtic language? Perhaps they arrived at very different times. And, where did they come from? If you enjoy puzzles, especially about your deep past, look up "Tartessian" and see how the lads in Bangor are upsetting the apple cart about the Celts. MEJ in Calif