SURNAMES as we know them today were first assumed in Europe from the 11th to the 15th Century. They were not in use in England or in Scotland before the Norman Conquest, and were first found in the Domesday Book. The employment in the use of a second name was a custom that was first introduced from the Normans. They themselves had not long before adopted them. It became, in course of time, a mark of gentler blood, and it was deemed a disgrace for gentlemen to have but one single name, as the meaner sort had. It was not until the reign of Edward II (1307-1327) it became general practice amongst all people. The surname Dempsey is now both numerous and widespread but its heaviest concentration is still in Leinster where the sept O'Diomasaigh (from which it derives) held sway on the borders of County Leix and County Offaly. In a very few instances persons of the name Dempsey have reassumed the prefix in recent years. The arms depicted here were of the Chief of the Clann Maoi Lurghra, whose territory lay on both sides of the River Barrow. At first the coat of arms was a practical matter which served a function on the battlefield and in tournaments. With his helmet covering his face, and armour encasing the knight from head to foot, the only means of identification for his followers, was the insignia painted on his shield and embroidered on his surcoat, the flowing and draped garment worn over the armour. 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 arms are recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884.
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