Not sure how these Isbell's might connect with yours, but just in case; Anna Leigh McCorkle wrote in her book, "Tales of Old Whitehaven" (published 1967 and currently out of print) on page 29, "The census of 1840 shows a Marion Isbell as being here then. However, the 1850 census gives the head of the family as Charles, born in Kentucky, and his wife, Ann from Alabama. Their children were Marion and George, born in Alabama, and Lafayette, Washington, Sally, and Mary, born in Tennessee. Wash and Marion lived along Millbranch near Raines Avenue. Frank Isbell now owns the old property. near his home the old family cemetery was located."
I am not familiar with the New Nonconnah Church Cemetery, but I found a New Nonconnah Missionary Baptist Church listed on the telephone book at 4701 Tulane Road; which is in the western part of Whitehaven. Not sure where the Isbell farm was that McCorkle says was near Millbranch and Raines. That area has been developed over the years and has houses and businesses. Several acres on the NE corner stood vacant for many years and was recently acquired by the city and a new City School built there. There was a P. Y. Isbell family that bought about 10 acres on the corner of NE corner of Millbranch and Wilson Road (formerly Jones Chapel Road) in the 1930's or 40's. Mr. P. Y. Isbell taught shop at Whitehaven High School and during WWII also ran a school that taught aircraft repair. He later founded a company called Southern Fabricators, Inc..which I believe his son still owns and manages here in Memphis. Their home on Millbranch is now owned by a family named Lott (I live on Wilson, just a block away). Hope this helps or is of interest.