Looking back through my files, I find William Rogers in Hamilton, TN 1850 U.S. census as follows:
William Rogers - age 70b. NC Mary"" 28b. TN William"9b. TN Shelton"5b. TN No Name"4/12 b.TN
According to my great uncle, James Igou, his grandfather, Andrew Jackson Igou had two brothers: Irvin (or Erwin?)and Samuel T. Igou and a sister named Mary Igou.She could be the MAry Igou who married William Rogers if your family legend is correct. Ervin (or Erwin??) Igou and hid brother Samuel T. Igou are both listed in the Hamilton County, TN 1850 census report.