Christianus Pfingsttag - Andrew Pinkstaff

Christianus Pfingsttag did not arrive in this country until 1749. He arrived with his wife Anna Eberwein and their daughter Rosina.
Therefore Andrew either cannot be born in Virginia and came later without his parents OR Christianus is not his father. I'm going with the latter.
There was a notation in the Pinkstaff family book noting that his father could be Michael who came into PA in 1737. But I have found a will from his wife stating that they had a farm in PA.
The only Pinkstaff that I have found in Frederick County, VA is a Sally or Sarah born in 1760. She married Stephen Lloyd and then James Smallwood. She could be a younger sister of Andrew but I haven't found her parents yet.
If anybody out there has a clue, let me know