There are lots of men named John Pollock who were born in Scotland.
Would you know the county and or city he was born in, in Scotland?
I think of Pollock as being a Polish surname and checked at surnamedb.com
They had this:
Pollak
This surname was one of the earliest German surnames into the United States of America, see below, and is associated with the period of Independence (1771 - 1783). It was also one of the earliest surnames in Europe, and were it not for the fact that many ancient registers and charters from the early medieval period are known to have been destroyed in the Second World War, it is probable that we would have discovered even earlier recordings. The name is national, and describes a former inhabitant of Poland. The origination is from the East Prussian 'Pol' (Pole) plus 'ak' meaning 'from', with Poland (the name) meaning 'the low land'. Their are many forms of the surname and these include Polak, Pollack, Pollach, Pohlack, Pollak, Polack, and Boelecke, the German dialectal variant.
Read more: http://www.surnamedb.com/Surname/Pollak#ixzz3Z6BOyNiR
There are a lot of good researchers on Wikitree and I expect that someone will be able to narrow down the search that you are seeking. Generally, a good way to trace back is to start with someone you know a lot about. That is, birth year and location, name of spouse, year and location of marriage (which you have shown), year and location of death. Take it back one generation at a time. Good luck in your quest!