From Wikipedia: The Nansemond River, for whom the ship is named, is a 19.8 mile long tributary of the James River in Tidewater Virginia. There is also a county and town by the same name.
OFFICERS ON THE CSS NANSEMOND as of October 1, 1864: From ORN.
Charles W. Hays, Lt., commanding
E.L. Dick, Asst. Engineer
James Turner, pilot
C.B. Bohannon, Acting Master's Mate