From NKAA, Notable Kentucky African Americans Database (main entry)
Claybourne, Jack
(born: 1910 - died: 1960) In 1941, Jack Claybourne won the Kentucky Negro Wrestling Championship from Hallie Samara in Louisville, KY. The following year he lost the title to King Kong Clayton. He won the Negro World Heavyweight and the Light Heavyweight Wrestling Titles in the United States. He was a recognized champion in Mexico, Australia, New Zealand, and Canada. His ring name was sometimes Jack "Gentleman" Claybourne.Jack Claybourne was born in Mexico, MO, March 8, 1910, according to author T. Hornbaker in Legends of Pro Wrestling. He committed suicide in Los Angeles, CA on January 7, 1960.
For more on Jack Claybourne see "Jack Claybourne" in Obsessed With Wrestling; Black Stars of Professional Wrestling, by J. L. D. Shabazz; "Jack Claybourne" at onlineworldofwrestling.com (includes photographs); Jae Jones, "Jack 'Gentleman' Claybourne, Professional Wrestler," 9/21/2018, at blackthen.com; "Jack Claybourne" at Alchetron.com; and "Jack Claybourne" at peoplepill.com.
*Additional information about the Kentucky Negro Wrestling Championship has not been located at this time.