You are close to at least 2 generations from finding your GF's ancestors with the names you ahve given me. Did anyone ever say where your husband's GF was born? That may help.
There are only two main "Robinson ancestors" in the South Georgia clan and both came from NC in the early 1800's - Fredrick and James Robinson (Robeson), Sr. They both came from Pitt County, NC.
The descendents of these brothers settled primarily in Wayne,Ware and Charlton counties. There was a later branch, via of one of James's son, John, that settled in Lowndes and Colquitt counties, but most stayed to the east, at least in the end of 19th Century.
I would say your husband's GF may well be related to the James Robinson Sr or Fredrick clan of Wayne and Charlton county but you would have to provide more ancesters than just those born in the 20th Century.
As an example, there is pitifully little genelogical information for the Robinsons much after the CW because so many of them died in that war, as well as the fact they were generally not the type of people that left a lot of newsworthy genealogical information lying about.
They did generally have a lot of children but these descendents have gotten scattered through the years as rural life has given way to a more urban society.
Your husband's GF is not directly related to my branch of the Robinson family. I also do not recognize any of the names but some of them are Robinson Family names - James, John and William. I would almost bet he was a descendent of the William, son of John that settled in Southwest GA. The reason I say that is because the line would be -- James, John and then William and your family has all three names. That's just a guess but I learned a long time ago that names run in families.
If you will drop me a note at JClarke@OutdoorWriter.com
I will send you a GEDCOM of this line down to the 1800's. Where your husband fits into this line I do not know.