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There were two James Pendarvises of close age who moved to Alachua Co., FL. The first born ca 1797 moved from St. George Parish, Colleton County, SC after the war of 1812 but before 1820 to Glynn Co/Wayne Co., GA with his family. He was likely a bother to Richard Lambright Pendarvis of Glynn Co., GA and relation or nephew to Joseph Pendarvis of Wayne Co., GA. George Pendarvis of Duval Co. FL, William Pendarvis and Mary Jane Pendarvis Burney of Nassua Co., FL were also siblings or near relations. He married Keziah Tucker in Camden Co., GA in 1824 and moved to Alachua Co., FL, as you said, in or around 1836. It is likely that he died between 1850 and 1860.
The second James Pendarvis, born ca 1808-1809, was also from St. George Parish, Colleton Co., SC, but did not move to Alachua Co. until 1859. He was connected to the Carns, Strobels, Gavins, Wimberleys, Wymers, and Traxlers who also settled in Alachua Co. over about a 20 year period from 1842-1862.
Would love to see your data on the Florida branch of the family.