I do not deal with ancestry autosomal DNA matches so cannot be of any help there, but hope your AtDNA results have been transferred into ftdna's projects. Please compare your Lemon matches/YDNA results from Family Tree DNA lab, Houston TX. Am sure you have joined your YDNA to the Lemon surname project(s) at ftdna. Work with your volunteer project administrator there -- YDNA testing/haplogroup SNP refinement has greatly advanced but you dont mention YDNA progress-do test and consider Big Y, which then is eligible to advance into YFull's excellent analysis.
Please refer to technologist founder of the YDNA, Todd DNA Project, Terry Todd, of Illinois USA, early scans of these Rev. Samuel Agnew pages (which are owned and held by the Kentucky repository as set forth earlier):
http://74.93.73.41/agnew/page-03.pngIsabella Lemon (4) b1820 m. Thomas Leghorn
http://74.93.73.41/agnew/page-02.pngMatilda Lemon m. ______ Dunwoody and had 10 kids, one of which is Martha Dunwoody, #6 of 10, m. D. McCoy [Nickles, McCrum, some Dunwoodys to America];
2nd child, Wm Lemon m. ______, and had a son David Lemon, ___________________ (no detail on this David...so ?)
Hope you consider and place the Lemon's of Ballymorran as stated on the Ros Davies' pages for County Down as set forth in this thread.
So yes Leghorn/Dunwoody/Lemon/Todd are all tied to my Group 2 YDNA Todd results--so not Group 1 YDNA Todd results (Mary Todd Lincoln line). My old notes refer to "William Lemon's property near Newbliss" --so perhaps you could study this clue. I see that Newbliss also arose in an email I received 3 March 2009 from Richard McMurty, which I quote here:
"By the 1858s, there were only 8 Todd families in Monaghan:
Emyvale-Annagh-Tiravera area: James, Mgt and 3 John’s about 25-30 km from New Bliss
Kilmore: Wm Todd only 11 km from New Bliss
Monghan: Elizabeth about 17 km from Newbliss
The next step for the Monaghan Todds would be to research the tithe records from the 1820s to get a picture of the Todds who remained behind. Then, the next step would be to begin systematically getting the marriage records of Todds in Monaghan from the 1840s and deaths from the 1860s to construct a family tree of the Monaghan Todds. This would not identify Andrew, father of Samuel Rutherford Todd b 1807 but it would show you the family that stayed behind and give a better idea of where in Co Monaghan Andrew came from. Depending on the DNA signature, you might even be able to prove connection to the Monaghan Todds who remained in Ireland. I can find no Todds in Co Monaghan today, but there are few in nearby Co Tyrone and Armagh.
Richard" [Richard McMurtry's email to Toddstown [rootschat], dated March 2009]