Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SYKES
As described in historical dictionaries
Patronymica Britannica (1860)
SYKES. JNIay be a nickname for Simon, like Gilkes for Gilbert, Hicks for Isaac, &c. It may, however, be local, as a sike in some dialects means a small rill, spring, or waterfall.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English