Melissa,
I think people tended to mix a bit more than used to be thought - but equally you could be right about Galloway. I'm sure that my McKinstray/McKinstry roots are from Galloway (Buittle, Newton Stewart, etc) but my people went to Ulster at some point. I have (I think) an Andrew McKinstry marrying Jane McBroom in Ballyeaston, Antrim in 1815. At least one of their sons returned to Scotland - to Ayrshire - whre my line starts properly
Brian in Arbroath, Scotland