«Researchers at New England Historic Genealogical Society have announced that Meghan Markle is descended from King Edward IIIEarlier this week I asked the genealogical society on Twitter if there was «Any chance of a book on Meghan Markle's ancestry like Reitwiesner/Child did with the former Catherine Middleton?» So far NEHGS has responded by clicking on the like button. But maybe a more detailed account of Meghan Markle's ancestry will be published closer to the wedding?
Markle is a cousin of her future husband, Prince Harry, more than 240 times over
She is related to Prince Harry through lines shared with both HM The Queen and the late Diana, Princess of Wales
She is related to eight American presidents, three first ladies, and a cast of other notable Americans, including actors James Dean and Roy Rogers.»
Having said that, I hope that the genealogist Gary Boyd Roberts, who is a Senior Research Scholar Emeritus at the New England Historic Genealogical Society (NEHGS), will return with more details about the sources for his claims made in the article mentioned above. His short entry about Ms. Markle's ancestry can be viewed here.
Postscript 30 November 2017 at 22.10: Christopher C. Child has just published the article The Wentworth Connection in NEHGS' blog Vita Brevis. Child gives more details with references to published books and has also provided a chart which shows one of the many connections between Ms. Markle and Prince Harry. Child also writes: «I’ve also been working on Meghan Markle’s American ancestors, so stay tuned!» So there is maybe hope for something more on Meghan's ancestry some time in the future?
Updated on 30 November 2017 at 22.10 (link to Roberts' entry and the postscript were added), last time on Monday 4 December 2017 at 12.50 (typos corrected).