I don’t know anything about Melungeons, but wonder if people here know about the “Jackson’s Whites”. This was a community of people my father told me about that lived/lives in the northwest area of New Jersey. He said they were a mixture of AWOL Hessian soldiers from the Revolution, run away slaves and Indians.
Rob Lowe was on “Who Do You Think You Are” (the UK version of that is much more tolerable, btw, many are on YouTube) and found out that his Revolutionary War ancestor *was* a Hessian, captured at Trenton during George Washington’s most famous raid. The number of Hessians who elected to stay here and become citizens was fairly large, much larger I think than the number KIA. Because they practiced something like primogeniture in Hesse, quite a number of Hessian soldiers were basically not getting anything in the will, and saw moving to North America as a pretty good deal. There’s a reference to this phenomenon also in that TV movie “The Crossing” (Jeff Daniels almost pulls off his portrayal of George Washington; good production; not quite a documentary of course).
https://www.youtube.com/watch?v=0df8d27xNVU
https://www.youtube.com/playlist?list=PLBEFC88C17D2C3149
http://www.newyorker.com/magazine/2010/03/01/strangers-on-the-mountain
http://www.newyorker.com/magazine/1938/09/17/the-jackson-whites
http://weirdnj.com/stories/fabled-people-and-places/jackson-whites/
https://en.wikipedia.org/wiki/Ramapough_Mountain_Indians