I haven't done much on South past 1860, but certainly Columbus is common here are a middle name in this family.There is a marriage register for Washington County VA you can get from the Family History Library film #0034389.That one goes from 1785 - 1902.I didn't look at these specific people, but did copy the index. On p 446 is a record for Charles E. and on 456 a record for Charles. Don't know exactly what years we are talking about here, p 436 is 1872 ( I looked at someone on this page)Page 456 is around 1893.Also in the 1880 Censusfor Washington County there is a Charles South , age 20, living with Clark A. South age 43.(vol 32, ed 100 sheet 1 line 1) No one in this family can read or write.In fact, most of these folks seemed to be illiterate. Thats all I know - it looks worth looking into.