Their appears to have been 2 Alexander Pope Norris's from Edgefield, South Carolina. One was born in 1840 to John Milton Norris of William and the other is already listed in some old records as Rev A P Norris while the other is still a minor. It is possible and probable that he is somehow related to William Norris's family but I have not located the exact connection yet.
William had two brothers, Nathan and Stephen. Nathan moved to Alabama but no A P Norris is in his will. Brother Stephen died in Edgefield 1846, I do not know who his children were. William was married twice, 1st to Elizabeth Williams and 2nd to Martha Naomi Bond. He had children with both wives but I do not know the exact number or all the names. William died 1863 in Edgefield. The Norris family cemetary is in Saluda but the list of family names that I have does not include many of them.
The A P Norris you are looking for could very well be the later one born 1840 above. He married Louise Rebecca Head. I do not have any death date for him or any children data. If he is, then his mother was Mary Ann Bouknight of Daniel Bauknight, Esq. and he had 5 (4 M and 1 F)siblings that I know of. This A P Norris's neice Mamie married the former Lt Govenor of South Carolina, Col James Tillman, whose father George Tillman was a Congressman for South Carolina. I have some letters from Mamie to my great aunt dated 1911. If this is the right line I would be intersted in any additional data you have.