If you would look at the Doolin DNA group at FamilytreeDNA a set of markers for William Dulin(g) ca. 1720, first son of Robert Dooling/Duling ca. 1680 of Essex county are listed.The markers between James Doolin ca. 1755 and William Duling ca. 1720 do not match.The two lines are not related.Two of my cousins have been tested and they match with a distance of 1. We do have a distant match of a Michael Dooley ca. 1801 of Kilkenny, Ireland. We were probably really Dooley(s).
The father of James Doolin ca. 1755 was a Robert Dooling ca. 1721 of Westmoreland county. He had two brothers a John and Nicholas Dooling.Their children are listed in the Overwharton Parish Records 1720-1760 of Stafford county, VA.I recently posted these records on this Genforum site.
I have a copy of "The Dulin Family in America" book.
Married (1) ca. 1774, pr. Loudoun Co., Va., Nancy Elgin, m. (2) ca. 1800, pr. in Kentucky, Mary ________, b. 1750; d. Dec. 1825, Pulaski Co., Ky.
"James is said to have found things too crowded when settlers began to come into Fayette County, so he traded the land he had for a new gun from back East and a good hunting dog, and went to Pulaski Co., where he lived the rest of his life, and died.
Records seem to show that James Doolin left Virginia much earlier than 1800, for he is shown on the tax records of Fayette Co. as early as 1787 for personal property, and he executed two deeds in Fayette Co. by which be bought land which, incidentally, joined land that Thadeus Dulin bought in 1798.(Deed Book V, p. 412-13).James bought his land in 1789 and 1790.The so-called Second Census of Kentucky gives a James Dulan in Pulaski Co., Ky., and also William and Cornelius Dooling in Fayette Co., Ky., so that these men, known to have been sons of James, must have stayed in Fayette Co. when their father, James, left to go to Pulaski Co.Both of these sons later went to Pulaski Co. also, as records there show."