This posting is interesting in that it advocates how one individual (Lord John Murray, Marquess of Atholl,2 May 1631-6 May 1703)allegedly populated certain Murray family lines; this includes the Swatara Murrays of Pennsylvania.
My Murray connection is through another line that seems related to this one: The Chillisquaque Murrays of Pennsylvania. The catalyst for this observation is based on the one tool which should answer (at least scientifically) whether ole' Lord John's seed has been planted so prodigiously among the various females of antiquity: DNA.
It is only through DNA testing that any hope of genetically tracing Lord John descendants (along with any relevant documentation) can take place. If you haven't done so, take the DNA plunge. You'll never know to which Murray line you belong. Possibly even Lord John's himself!