Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
FITCH
As described in historical dictionaries
Patronymica Britannica (1860)
FITCH. A polecat — perhaps the sign adojted by some medieval furrier. It may however be a corruption of Fitz. H.R.
Surname type: Location or geographical feature
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English