This list of names is taken from the US Civil War Soldiers and Sailors System (CWSS). It is a listing of over 6 million names that was computerized by a number of bodies from the records of the National Archives and Records Administration. Each name is taken from a General Index Card that is in the file of each soldier. These were compiled in the 1880s to determine who was eligible for a pension. As a result, the same person can be mentioned a number of times. Currently, not all sailors have not been indexed on the website.
More information on all soldiers and sailors can be found at the CWSS website http://www.itd.nps.gov/cwss/