Here is an extract of a post to GENFORUM considering the surname REES. Montgomery Co PA as that is where I live. Athough this county was not formed until later as you state, Lower Merion and Upper Merion (maybe others) Townships were formed in the 1600s. There was a significant migration of Welsh into this area---some were Quakers and some were not. A significant number of these were named Rees. Mention is then made of a later move to Delaware County. I seek Elizabeth REES who married George Killinger/Kellenger Fitzgerald and who had been born in the late-middle 1700's. I haven't a clue concerning her parents. She is buried at Laurel Hill Cemetery. I do not have my dates with me, but it was somewhere around 1768-88. I tend toward the latter, from memory. Can you help? Thanks, Vince Summers (great-great-great grandson)