I'm not sure if I can help or not. In the 1850 census of
Madison Co.,Prairie Township, AR there is an
Archibald and Nancy
Evans. They list a son, William age 7. This would be the approximate age of your William. It shows
Archibald Evans, age 41 farmer birthplace TN. Wife Nancy 38 b.TN
James 20,b.TN,Elizabeth 18,b.TN.Nancy 15 b.TN,
Marcy 13 b. KY,
Levi 10,b.MO,William 7,b.MO,Susan 5,b.AR, Francis 3,b.AR and Martha 5months,AR. My family William and Delila
Evans are living at Dwelling 107 and
Archibald is living at 104. Our oral history also mentions "native american" through this line. I have unable to uncover the link however. Idon'tknow if this helps or not.