Checked my History of Williamsburg, by William Willis Boddie, 1992 edition, and found only a single male, William Cox, in Williamsburg Co., in 1790 census. There is a C. W. Cockfield, and a J. C. Cockfield mentioned in the book, but no Cleland. The Cockfield properties are shown in the northern section of the county, toward Marion County and Darlington County. The other Cox's mentioned are in lists of Civil War military units, during the 1860's.