This name is predominantly found in Munster but also found in considerable numbers in the other provinces, the surname CASEY, sometimes in use with the prefix 'O' is borne by families descended from a number of unrelated O'Cathasaigh septs. One of these septs held sway in the barony of Balrothery West, County Dublin, but was displaced in the Anglo-Norman settlement of the Pale, and scattered. Another sept of the name was established in County Limerick with a sept centre near Bruff, another in the barony of Condons and Clangibbons in northern County Cork near the County Limerick border, and others in the Counties of Connacht, Mayo and Roscommon. Ireland was one of the earliest countries to evolve a system of hereditary surnames. They came into being fairly generally in the 11th century, and indeed a few were formed before the year 1000. Casey is the name of a family established for centuries in the parish of St. Martin, Guernsey. Their earliest traceable ancestor was Jean Casey, who lived at St. Martin in 1393, but the surname in the form Casee was recorded there in 1288. This is probably the Norman name. The family who held the estate of Anthony in Cornwall throughout the Middle Ages, seems to have received their name as a variant of Carew. Most of the European surnames in countries such as England, Scotland and France were formed in the thirteenth and fourteenth centuries. The process had started somewhat earlier and had continued in some places into the 19th century, but the norm is that in the tenth and eleventh centuries people did not have surnames, whereas by the fifteenth century most of the population had acquired a second name. The associated coat of arms is recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884. Registered at Raheny, County Dublin. The eagle depicted in the crest is emblematical of fortitude and magnanimity of mind. The Romans used the figure of an eagle for their ensign, and their example has been often followed. It is the device of Russia, Austria, Germany and the United States of America.
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