Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
RIGGS
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
From the Danish rig, wealthy, rich; or the name may be local, and denoting a steep elevation, a range of hills, or the upper part of such a range.
Patronymica Britannica (1860)
RIGG. RIGGE. RIGGS. Rigg is the medieval spelling of Ridge, which see.
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 name of parent
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English