Ancestral Names in the Shamrock area: Arnold, Bane, Barnes, Bishop, Blunkhall, Board, Boone, Boswell, Brandenburch, Buck, Callison, Cason, Cathcart, Clare, Clement, Cluster, Cobb, Covington, Dillard, Dishman, Downey, Duff, Erwin, Evans, Freeman, Garver, Hall, Hamilton, Harrison, Harvey, Hawkins, Hayden, Hibbert, Hill, Hirsch, Hoffman, Houchins, Hudson, Jefferson, Jones, Kettles, Kindig, Lail, Lavender, Maddux, Mauchas, Maupin, Moore, Moser, Mumford, Neff, Netherton, Noel, Norris, Owen, Oxley, Paden, Payton/Peyton,Pogue, Potter, Powell, Rhinehart, Roberts, Roland, Rollison, Sailor, Scholl, Shamblin, Simpson, Smith, Stewardson, Tate, Todd, Walker, Wells, White,Williams, Zumwalt.