Washington Surname

English: habitational name from either of the places called Washington, in Tyne and Wear and West Sussex. The latter is from Old English Wassingatun ‘settlement (Old English tun) of the people of Wassa’, a personal name that is probably a short form of some compound name such as Waðsige, composed of the elements wað ‘hunt’ + sige ‘victory’. Washington in Tyne and Wear is from Old English Wassingtun ‘settlement associated with Wassa’.

Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4