Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
HARROLD
As described in historical dictionaries
Patronymica Britannica (1860)
HARROLD. The Irish family suppose themselves to have been introduced into that country on its invasion by the Danes, which is very prolably the case.
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