Caleb Cox

Hello Coxes! So I am stuck. Here is my tree so far starting with myself.

Michael K Cox
born 1979, Okinawa, JP
son of Patricia Larson and

Roy K Cox
born 1956, Pasadena, Texas
son of Ann Roemer and

Keith B Cox
born 1932, Plainview, Texas
son of Ethel Finkenbinder and

William Cox
born 1897, Texas - died 1941, Austin, Texas
son of Lila (Lillia) and

Joseph (Joe) W Cox
born 1878, Mississippi - died 1951, Texas
son of Sarah Lucinda and

Richard Cox
born 1850, Mississippi - died 1934, Lockney, Texas
son of Elizabeth Hicks and

Caleb Cox Jr
born 1810, Randolph Co, North Carolina - died 1889, Lewisville, Texas
son of Nancey Seals and

Caleb Cox Sr
born 1765, Virginia - died 1847, Mississippi
son of ????

There is a record of land being gifted to Caleb from a John Cox, but no other FIRM information can be found. There is so much speculation beyond this point. I've found three separate lineages from this point that are plausible. If anyone else has any ideas, I'd love to hear them. Thanks!