Right after I posted my previous response, I looked back on this Forum, and found one of the messages posted about the subject. It was a book she was quoting from which contained some of the same info from the microfilm I had seen.
Here is the link to the message:

http://www.afrigeneas.com/forum-fpoc/index.cgi/page/3/md/read/id/10633/sbj/free-blacks-in-dismal-swamp-names/

I do see the WINDBERN surname included.

Deloris