Hi.My name is Tim Dunn.I'm very interested in your posting.I think I can help--at least a little.The David Dunn you're describing appears to be a member of the Dunns of Fairfield Co, SC.Look at the 1790 South Carolina Federal Census for Fairfield County.You'll see four Dunn households listed:David, Joel, William and Jesse.I am descended from Jesse who about 1799 moved to Warren Co, KY.I am researching this men but I must tell you up front that it's been a difficult struggle to determine their origins.I think these four men may be brothers but I certainly can't prove it.They may not all be related so some may have a different origin than the others.I have a genealogist in SC working on this for me.What evidence exists suggests either a VA or a NC origin (or VA to NC to SC is also possible--actually a NJ origin is also possible but remote).David appears earlier in SC land records as early as about 1774.His land is on Second creek which is actually in northern Newberry County today.David clearly had a relationship with a Jeremiah Pierson (also spelled Pearson).Both David and Jeremiah's son, Jeremiah Jr. appear about 1806 in Warren Co, GA which tells me it's the same David Dunn as was in Fairfield Co, SC.I would guess your David Dunn is actually David Dunn Jr., son of this David Dunn--however, it is also possible that he was a son of William or Joel (I know he was not a son of Jesse).
I also have to comment on your name.Clarrisa or Clara is a name of one of Jesse Dunn's grandaughters.The name appears among more than one of these mens' families.It is fascinating to me that you have this David as your ancestor and that you have the name Clara.That name has probably been in your family for more than 200 years.
I have more tidbits but it will take time before this is sorted out.However, I'm rather dogged about problems like this and(by the grace of God) I will sort all of this out.There are many, many Americans descended from these men.As you can see from the 1790 census, these 4 men had more than 20 children between them.How many descendants--hundreds if not a thousand or more.
Anyway, I'd love to hear about your research and I'll share with you what I have.Perhaps you'll have some insight that will solve everything."In the abundance of counselors there is success."Oh yes, by any chance does your Dunn family have any Baptists in their background?Oh, you'll also be glad to know that most of these men served in the Revolution.Also, don't assume they're Irish.Until you trace a Dunn family back to their point of origin you won't know whether they're Irish, English, Scotish or Welsh (you can find Dunn/Dun/Dunne/Doyne/Dwn etc in all places back into the 12/13th Centuries.Sorry, I've gotten carried away.You can reach me at firstname.lastname@example.org.Send me a note!