My Dunn family was from GA (central and southwest mostly).My 3g grandfather was David Dunn born 1784 (wife Susannah born 1795).He appears in Twiggs Co GA 1818.There was a David Sr., David Jr., William and Jacob.I think David Jr. was my 3g grandfather.David Dunn was in Houston Co 1820 and Marion County 1840 and 1850.Children of David and Susanna (all born 1813 - 1840 range, listed in order of birth) were Mary Ann, William Jackson, Elizabeth Lydia, John C., Green B., Lucinda Sharon, Isaiah David (my 2g grandfather), Susannah M. Marion B. and Washington L. Dunn.My 2g grandmother, Jane Murray Dunn, moved to Texas around 1876 as a widow after Isaiah died. The other Dunns stayed in GA mostly.
William Jackson Dunn's sons:Andrew Jackson, Thomas Jefferson, Green William, Joel Warren, John Calvin (some moved to AL)
Marion B. Dunn's sons: William L.
Washington L. Dunn's sons:Robert, Walter M., Thomas
I haven't yet traced the descendants further, but there might be a connection with your Dunn family.
What counties in GA were your Dunns from?There was another cluster of Dunns in Oglethorpe around 1800.