I did some more detailed research on ancestors. Here is what I found so far. Starting with me, I followed a Griffith line back 10 generations: Robert (1924), Frank (1875), Thomas (1847), Mary Ann (1813), Abner (1784), William (1742), Thomas (1708), John (1692), William (1666), and John. Birth dates are in parenthesis.
Thomas (1708) was born in Nantmel, Radnorshire, Wales and emigrated to near Menallen Township near York, PA and died in 1769.
John (1692) was born and lived in Nantmel, Radnorshire, Wales and died there on 4 April, 1745.
William (1666) was born in Penhesgin, Llanfaethlu, Anglesey, Wales and moved to Nantmel, Radnorshire, Wales where he died; date unknown.
I couldn’t find a trace of the last John’s parents. He was also known as John Griffith Ap Griffith and was born in Penhesgin, Llanfaethlu, Anglesey, Wales. He married Margaret Verch Ap Thomas.