While I don't know of the family in particular that you are looking for, I do have a few LOCUS/LOCUST/LUCAS names in my files who intermarried with mine in the 1800s in North Carolina, and I have helped several people researching their own families with those surnames. They were mostly in Nash & Wake Counties, but I do believe that Nash is where the majority of the Families originated since they are in the early records there; they were never slaves. I also have a few EATMANs in my files, who were mostly whites who married members of the mixed blood communities in Nash Co. As you probably already know, Nash was one of the Counties from which Wilson was formed in 1855.
The families were actually among the free people of color who were researched by Paul Heinegg, for whom he has some of the records about their origins on his website:
http://www.freeafricanamericans.com/Lemon_Lytle.htm

His research shows they were likely descended from Elizabeth Lucie, a white servant woman in Charles City County, VA in the 1600s, who had a child with a black servant.
While I use Ancestry.com for research all of the time, I don't use them to create a tree, but I do have a tree on Rootsweb which I update all of the time and often shows up in some of Ancestry's tree databases.

Deloris Williams