Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CREASY
As described in historical dictionaries
Patronymica Britannica (1860)
CREASY. Doubtless from Crecy in Picardy, so memorable in English history for the battle between Edw. III. and the French. The family are said to have come hither at the Conquest. Cressy appears in Holiushed's list. The name has undergone many changes in orthography. Among the tenants of the manor of Eobertsbridge, temp. Eliz. was an Edward Crescye, and Crescye was at that period the mode of spelling the French town.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English