My information came from a researcher at the Genealogy Centre in Derry, which probably has more info than what's available on the web.He gave me photocopies of the Household Lists of 1740 and several listings for Wintons in Derry in the late 1600s and early 1700s.The only ones that had any remote possibility of being connected with John Winton of PA were the entries from the Household Lists of 1740.
As far as a connection with Andrew Winton of Connecticutt (1643), there's no concrete evidence connecting John Winton of PA with Andrew's descendants - a number of whom settled in NY and Northern PA by the early 1700s.The earliest PA record shows an "Edward Wanton" filing a land claim for 202 A. in Bucks County in 1702.
Naming patterns often are helpful.When comparing name patterns in Andrew's line with John Winton's line, though, there is no similarity.Andrew's line is filled with "Andrew" and "Nathaniel," whereas John Winton's line is filled with "William," "John," "James," and "George" on up into the mid-1800s among more than a dozen family groups in five different states, which gives a strong indication that the male names were similar in John's family prior to 1743.It was a very strong European tradition that didn't start fading in America until the Early 1800s when a living Revolutionary War connection was quickly fading and the War of 1812 galvanized a solid national identity separate from Europe, which lay the foundation for breaking with its traditions.
That's not to say that John Winton isn't connected to Andrew Winton's line.Anything is possible in genealogy, which you probably know by now.However, there are no strong indicators pointing in that direction.
It's possible that Mary Winton's maiden name is "McCoy."Again, there's no concrete evidence or strong indicators for it.
John and Mary Winton's farm was adjacent to the McClellans and they shared the same spring while the McCoys lived almost two miles east of them on the other side of three other landowners who were Maxwells and Lowrys.Their oldest son William probably was born prior to 1743, which means the various family groups came together to West Conococheague Creek.So, a major question arises as to why John and Mary Winton with an infant/toddler/young son settled with the McClellans instead of with the McCoys if indeed Mary was a McCoy.
Ny ancestor is Mary's grandson and was named "McClellan."Also, Mary was living with John McClellan's widow when she died.Some McClellan researchers believe John McClellan's widow was his second wife and that she was possibly a daughter to Mary, which doesn't rule out Mary being a "McCoy."
My point is that there are multiple ties with the McClellans, while the McCoys are simply neighbors who could possibly be related to Mary.It's possible that Mary's McCoy family ties faded once she married John and their children then intermarried with the McClellans.The scanty historical record is hiding the hard facts if that's the case.
Hope that helps to explain my theories and present research focus.Please let me know if you would like copies of the Household Lists.I can scan and email them to you.