Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
POLK
As described in historical dictionaries
Patronymica Britannica (1860)
POLK. 1. A contraction of Pollock, and sometimes of Pocock. 2. A iool. Halliw.
Region of origin: Europe
Country of origin: Germany
Language of origin: German