I, too, have been wondering about Joe Adcock, the outstanding baseball player. My grandfather Adcox (Adcock) told me that he was related to Joe. In some notes I found, there was a reference to the baseball player. According to this, Joe was the grandson of Thomas L. "Joe" Adcock who was born in Tennessee but moved to Oklahoma. Thomas's father was Joel W. Adcock b. 1814 in VA. My line proceeds from Joel to James Alton Adcock, then to Alford Harrison Adcock and then to my grandfather, Floyd Granvil Adcox.
I have no way of knowing if this is true or just another Adcock branch wanting to claim the famous player. My grandfather told me that the ballplayer was from Oklahoma. I will try to find a biography of Joe Adcock to see if there is any family information there. My Adcock relatives left Tennessee for Texas and settled there.