Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
DICK
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
The familiar abbreviation of Richard. It may come from the Dutch Dyck, a bank or dike, a bulwark thrown up in the Low Countries against the sea or rivers to prevent inundation.
Patronymica Britannica (1860)
DICK. See Richard.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic