Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DICEY
As described in historical dictionaries
Patronymica Britannica (1860)
DICEY. Probably local— though Ferguson thinks it may be 0. Germ., Disi or Disa, from Goth, deh, wise.