Thanks to both of you.
I have found a record on Ancestry stating that Jonah was born possibly 25 Dec at Tinwald, Dumfries-shire, Scotland not 1726 as a relation had previously found out
Parish records show his marriage to Mary Carruthers which I believe to be correct as
Marriage Date: 31 Jul 1756 
Marriage Place: Dumfries,Dumfries,Scotland 
Spouse:  Mary Carruthers   
FHL Film Number: 1067960 
This also means his father could be 
John Nicholson
Birth 1697 in  Tinwald, Dumfries-shire, Scotland  
But I have no evidence
Crystal