Julia, my Allens came out of Texas. They had not relatives in Pottawatomie County, OK that I am aware of except family. Robert Alonzo and Newton A. Allen both lived in Shawnee. To my knowledge Newton never had a family. Robert is my maternal grandfather. He married a Sarah Ann Smith and they had 9 children, four died in infancy. One died at the age of 20, unmarried. Clifford B., Lola M. [my mom], Edna A. and Ruby J. Allen, lived. Clifford never had any children, nor did Ruby. My mother, Lola, had three Cooper's.
Clifford died near OKC, Edna in Bakersfield, CA, Ruby in El Paso, TX and my mother was living in Tahlequah, OK but passed away in 2001 in Bella Vista, AR.
Don't believe we have a common relative that I am aware of.