My Cash family line starts with two sister: Elizabeth and Sarah Cash. Both were my Fourth Great Grandmothers, as their descendants would eventually marry and bring the line back together. Thus, I am twice over a Cash descendant.
Elizabeth and Sarah Cash's parents were Moses Cash (abt 1785, VA - 1846, GA) and Nancy Hudson (abt 1790-1823, GA), who were married on 6 Sep 1808 in Elbert County, Georgia. The couple had many children, among them Moses Reuben Cash, the ancestor of singer Johnny Cash (making him my 3rd cousin, 3x removed). Moses had come south from Virginia with his parents, John Cash (1757, VA - 1836, GA) and Lucy Campbell (1760, VA - 1848, GA).
John Cash was born in Amherst County, Virginia and enlisted there in 1776 to become part of the Cherokee Expedition (against Cherokee who were allied with the British) during the Revolution. I'm currently trying to join the DAR through this ancestor.
A map of modern day surname distribution shows that the Cash name is still popular in Amherst County (http://publicprofiler.org). My direct ancestors might have moved on, but many of their descendants stayed put.
One thing thats' great about this line is that it is backed up by DNA! I have four different DNA matches on my Cash line. In the chart here, you can see three of those matches (from ftDNA) and the DNA that they share with my dad, though none of them are on the same segment. Yay!