Looking for Cranfords from Oklahoma

I'm looking for some information On the Cranford families of Pushmataha and Leflore counties in Southern Oklahoma. I've been trying to find out if we are Choctaw Indian. My g-grandfather's name was Burtis R. Cranford. He came to Oklahoma from Walker Co. Alabama with his wife Elizabeth and his sons in the late 1880's. Any information would be greatly appreciated.