The English and Irish surname Day is derived from the Middle English personal name Day(e) or Dey(e), Old English Dæi, apparently from Old English dæg ‘day’, perhaps a short form of Old English personal names such as Dægberht and Dægmund. When found in Ireland the name Day is an anglicized form of the Gaelic name  Ó Deaghaidh. The first written reference to the name is in 1095 when Godina Daia, is recorded in the "Feudal Documents from the Abbey of Bury St. Edmunds", Suffolk. Today there are approximately 102,000 people living in The United States with the last name Day..

DAY FAMILY CREST PENDANT