I grew up in the Ozarks and my grandparents were from Ozark Arkansas a place I have visited often  Ive never heard that Ozark stood for toward Arkansas and believe this is incorrect  In the case of Ozark Arkansas at least the aux arc referred to the bend or bow in the river that the town was formed around  With respect to the general region I suspect that the the term may have referred to the shape of the hills themselves that is inatamong the arcs hills