Most the names you mention ring a bell. Specifically the Roberts that settled Hamilton county, IN area mid 1830's(Roberts Settlement which included the Newsomes, Loclears, Revels Sweats, Iverys, Gilliams and others).

In my serach to find Charles Hammond- I have come across several Have items on the web in regards to the FPOC Hammonds & Locklears, along with the Lowerys of Robeson county, NC (Saddletree swamp area).

Chavis I am familar with as I run across the name very frequently doing research on my Banks/Hammond/White/Burdine family lines- which is my grandmothers side-just a matter of time before a Chavis pops up on this tree:) Interesting enough though I also have Chavis's from North Carolina in my tree on my grandfathers side (James C Chavis born 1873 NC died in Ohio-- his son was Charlie born 1894 in Mt. Airy NC).

I was once told by the author Coy D. Robbins who has written extensively on Af Am settlers of Indiana that he had a lot of Hammond info in his book on Orange county, In. I dont have that book- however it may be helpful in your search. Its called "Forgotten Hoosiers: African Heritage in Orange County, Indiana", Roy D. Robbins.

While I dont have the above book, I do have a book Mr. Robbins wrote in regards to the settling of Salem, IN by Af Am's pre 1850. Did a quick look up in the index and the following names appear:

* Revels family of Hamilton County
Rev Hiram R Revels
Rev Wills R. Revels
Susan Jones
Willis Revels

Roberts Family in Orange Co, IN
Roberts Settlement of Hamilton county

Roberts in Salem, IN (Washington County) Pre 1820-1850
Charles Roberts, Dinah Roberts, Elias,, Ella, Ellen, Emeline, Emily, Henry, James, Joseph Jenkins Roberts, Kinchen, Kinchen & Nancy, Lisle, Maria, Mariah, Matilda, Rev Thomas, Rev Turner W., Sarah J., Turner, Zachariah

If any of the above are familiar to you and you want a look up just shoot me an email and I will do a more extensive look up for you.

Thanks!
Stacey