The original McClurgs to Mercer County Pennsylvania were from the North of Ireland. The McClurgs/McClorgs of York County, PA appear to be straight from Wigtownshire of Scotland.
In the 1782Tax list of York County, PA, there were at least 5 William McClurgs.McClorgs listed as property owners. it is uncertain if there were five individuals there named William, as one could own several properties. I have worked on the migrations of all McClurg families out of York County, and only find one William went to Ohio, and My ggg grandfather, William McClurg recieved bounty land in Tennessee for Rev. War Service.
As for NY McClurgs, the privacy act of NY restricts the public records for 70 years after a subjects death, and relying on these records in research, I wasn't able to research NY.