I know this post is old, but I know that while some Colquhoun clan migrated to the US and filtered through North Carolina, Georgia, etc.......there were also some that came in, I believe, around the NorthEast coast of the US into Canada.....I had seen someone who was a descendent of them on their own blog pages, post that they were in Canada up until a few generations ago and are now in the Oregon and Washington area.....hope this helps, and best of luck