Believe your Keltner family of AR are those that descend from the Keltners of SC (late 1790's, early 1800's) and then eastern TN. Do not know if your Keltner line is related to my Michael Kelchner/Keltner line of Germany, Pennsylvania, Virginia, Tennessee, Kentucky, Illinois, Missouri, Arkansas and etc.
At the present time, YDNA, would be the means to settle this question. Maybe this has already been done, if so, I am not aware of it. Brian Keltner or anyone else have any pertinant knowledge concerning such???