In case you don't have the marriage extract..
14 Apr 1706, Galston, Hugh Campbell and Mary Paterson, Dalgairn, married at Dalgairn
Also with 9 children you probably have a good idea of both of their parents names using normal Scottish naming patterns. I would use Galston, Loudon, Kilmarnock records at the local Family History Centers., etc.to track down Hugh's parents if you haven't already done so.
I have Hugh repeatedly in our line starting with the 1750s which is where my wall is. But it is still in Scotland.