De Lacy is a surname that has historical significance, particularly in England. It is associated with the De Lacy family, who were prominent landowners and nobles during the medieval period. The family held various titles and estates, including the notable Lacy Castle in Cheshire. The De Lacy family played a role in the political and social landscape of their time, often involved in the governance of their regions. Their influence extended through marriages and alliances with other noble families, contributing to the feudal system in England.