I, too, would love to figure out all the Fredericks in the Horry area.And I am not trying to dispute your information but am trying to make sure that it is provable. A Frederick Floyd DID marry Sarah Pittman in 1809, but which one?There were two Fredericks listed in the 1810 census and in 1820 there was one Frederick with a wife (probably your family) and there was Sarah Floyd, widow. Unless someone has researched the Pittman family and can share a birth date for Sarah, how do we know which Frederick married Sarah Pittman? The letter about the grandmother doesn't seem to indicate if it was Harmon's paternal or maternal grandmother. The names that you give are very similar to those named as heirs of James (d. 1828) and Elizabeth Floyd's son Frederick and may be a possibility.