Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DEASE
As described in historical dictionaries
Patronymica Britannica (1860)
DEASE. " Of Milesian origin." B.L.G. But as the oldest individual of the family of Dees or Dease adduced, lived no longer since than the days of Heury VII., we must take this statement at its fair value.