John & Zilpah (also Zilphy & Zilph[i]a) COGGIN moved from Fairfield to Chester Co., SC, about 1800. The widowed Zilpah moved to Georgia about 1818—first to Jasper Co., then to Walton Co., and finally to Newton (formerly Henry, now Rockdale) Co. Then some of the family moved on to Chambers Co., AL about 1833.
John's brother appears to be Revolutionary War soldier William COGGIN, born 1755 SC(?), died 1862-1863, Gordon Co., GA. William's uncle (his mother’s brother?) was Richard YARBROUGH. Richard's brothers include Owen & Thomas Griggs YARBROUGH, also probably William & John YARBROUGH—all possibly the sons of Thomas Griggs YARBROUGH & Mary SPURLOCK of Virginia. William COGGIN’s mother may have been a Mary YARBROUGH. According to the pension information, William COGGIN's father was Thomas COGGIN, who died while in Virginia on business in 1775.
William COGGIN probably moved to Georgia after the Revolutionary War & then returned to South Carolina by 1820 to live in Spartanburg Co., then was probably the William in Pickens Co., SC in 1840. William COGGIN appears to be the William who was in Habersham Co., GA, by 1850 with his first wife, Jenny(?), born about 1755 SC. William married second, in 1850, to Cynthia STEWART COX, born about 1800 SC, widow of Abram or Abraham COX, in Gordon Co.
William COGGIN had a son William, Jr., & probably sons Richard & Thomas & likely other children as well. This Richard COGGIN(S) appears to be the same Richard COGGINS who later is in the 1860 Haywood Co., NC, census, aged 81, born SC; Thomas COGGIN is probably the Thomas COGGINS in 1850 Chickasaw Co., MS, census, aged 67, born SC.