Do you have a male Coleman line marrying a Mann woman? If so, could there be children named Albans O. Coleman or Wilbur T. Coleman?
In her 1852 will, Martha O. Green (m/n Martha O. Mann) leaves Watkins Turner two slaves to be sold for the benefit of two nephews with those names. Prior to marrying William T. Green around 1848, she was married to George Rowlett.
My current research is showing close associates Watkins Turner, Matthew Allen, and William Green all apparently linked by marriage to Mann women who were born in the late 1790's or early 1800's. At least one, Elizabeth C. Mann (wife of Matthew Allen) was the daughter of Daniel Mann.