I don't know off hand. I've always known it as Black Hickory. It is not in the VA Tech search probably because it is not native to the eastern seaboard. Its mostly a Ozark region hickory. Scientific name is Carya Texana.
After educating myself on Pignut, it is probably the more likely candidate. My quick assumption was based solely on the bark of Black Hickory, which oddly enough is almost identical to Pignut.
My mistake fellas
18.5" OTS, 22.5" OTG, CB Silver(Rip), Vintage Coleman Bullet, Pit Barrel, UDS