Ameena,

If you haven't already you might want to take a look at Melvin Ely's book Israel on the Appomattox - A Southern Experiment in Black Freedom from the 1790's Through the Civil War, the Evans family is mentioned.

Although the book focuses on the individuals in the commuity named Israel Hill which was formed by those slaves who were freed by the will of Richard Randolph and finally received their freedom and land by 1810-1811, it gives in great detail the activities of those individuals in that county over a 80 year period before the general emancipation. There were already other free black families in the county, including the Evans' prior to the establishment of Israel Hill.Not sure if this is necessarily your Evans Family but I am sure there is some kind of connection. Author also has great footnotes/endnotes

page 69
"In western Prince Edward, free mulattoes JOhn and Charles Evans wo may have been brothers, bought sizable tracts of land - nearly 120 acres each in 1794, two years before Richard Randolph died."

There are two references to a Dennis Evans:

page 130
"Free black men, too, worked as millers they included Dennis Evans, who belonged to a clan of former landowners, and Phil Bowman, devoted husband of the slave Priscy.

page 364
"The Evans family ran a close second to the HOmeses in the purchase of land and lots. Theirs, too, reads as a tale of resilience - a comeback by a free black clan that had owned land in the distant past but given it up in the early century....Dennis Evans purchased 14 acres of rural land for a bargain price at about the same time, after he had passed age 60; his various jobs as a carpenter including repairing the lot on which the county clerk's office sat."