Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
WYCH
As described in historical dictionaries
Patronymica Britannica (1860)
WYCH. WYCHE. A salt springwhence the termination of Northwich, Droitwich, Nantwich, &c. The medieval form is De la Wyche, the surname of a canonized bishop of Chichester.