There are 703 with the Yocum surname at Wikitree. You can check them out if you go to the upper right of the page and click on Find. Scroll down to Surnames. Then, enter the Yocum surname to get to the list. There was a George Washington Yocum who lived in Missouri.
The states that include the Ozarks include Arkansas, Missouri, Oklahoma, and Kansas.
You may want to initiate a Yocum one name study.