Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
IRONSIDE
As described in historical dictionaries
Patronymica Britannica (1860)
IRONSIDE. A title of valour, wellknown amongst us, from the days of the Saxon Edward, to those of Cromwell's ' Ironsides,' and since, whenever we speak of a robust person. Berry attributes five coats to this surname,