McGillack History, Family Crest & Coats of Arms
The surname is one of the Anglo-Norman names that came to Ireland in the 12th century. The surname McGillack is derived from the Old English word "burh," which is derived from the Old German word "burg," the common Germanic word for a fortification. It seems likely that the first family to bear this surname would have lived in or near a prehistoric fort situated on a hill. In the Norman fashion, surnames created from place names or geographic locations were prefixed by "de," which means "from" in French.
Early Origins of the McGillack family
The surname McGillack was first found in County Galway (Irish: Gaillimh) part of the province of Connacht, located on the west coast of the Island, where the family name is descended from the Norman noble William Fitzadelm de Burgo who went to Ireland in the Anglo-Norman invasion of Ireland and was the succeeded Strongbow as Chief Governor.
"Robert de Burgh, Earl of Moreton in Normandy, son of Harlowen de Burgh, by Arlotta, his wife, mother of William the Conqueror, participated with his half-brother in the triumph at Hastings, was created Earl of Cornwall, and received, as a further recompense, grants of seven hundred and ninety-three manors. His son, William Earl of Cornwall, who, rebelling against the Henry I., joined Robert of Normandy, and led the van at the battle of Tenchebray. He fell into the hands of his opponents and was sent prisoner to England, where he was treated with much cruelty, and detaining him in captivity for life. He left two sons: I. Adelm, from whom descended the Burghs, Earls of Ulster, the noble House of Clanricarde, and the various families of Burke, so widely scattered over the south west district of Ireland; and II. John, whose son, Hubert de Burgh, Earl of Kent, was Justiciary of England, temp. Henry III., and one of the greatest subjects in England." 
Great stretches of land were given to this family in the year 1177. Richard Oge de Burc, son of William, became the "Lord Justice of Ireland" under King Henry II in 1177 and was regranted the lands of his father the following year. 
Richard Mor de Burc, the older son of William, was the ancestor of the family name Bourke or Burke. They formed several septs, the two most important having been the MacWilliam Uachtar sept of county Galway, and the MacWilliam Lochtar sept of county Mayo.
It should be noted that not all of the family were in Ireland as some were found in Knaresborough, in the West Riding of Yorkshire in ancient times. "At the time of the Domesday Survey it formed part of the royal demesnes, and was given by the Conqueror to Serlo de Burgh, Baron of Tonsburg, in Normandy, who had accompanied that monarch into England, and by whom its stately castle, now a ruin, was originally built, on the rocky heights north of the river Nidd." 
Another noted source confirms Knaresborough as a point of origin, but has a different Norman baron: " 'Burgh' must here stand for Serlo de Burgh, a powerful Northern baron in the time of the Conqueror, who built Knaresborough Castle, and appears to have taken his name from the manor of Burgh, in Yorkshire. " 
Early History of the McGillack family
This web page shows only a small excerpt of our McGillack research. Another 140 words (10 lines of text) covering the years 1227, 1503, 1544, 1582, 1601, 1572, 1635, 1604, 1657, 1590, 1667, 1629, 1647, 1647, 1667, 1598, 1672, 1666, 1642 and 1722 are included under the topic Early McGillack History in all our PDF Extended History products and printed products wherever possible.
McGillack Spelling Variations
Church officials and medieval scribes often spelled early surnames as they sounded. This practice often resulted in many spelling variations of even a single name. Early versions of the name McGillack included: de Burgh, Burke, Bourke, Burk, Bourk, Gillick and many more.
Early Notables of the McGillack family (pre 1700)
Notable amongst the family up to this time was Theobald Bourke, 8th Mac William Iochtar and lord of Lower (North) Connacht, died 1503; Ulick Ceann Burke (died 1544), 12th Clanricarde and 1st Earl of Clanricarde; Richard Sassanach Burke, 2nd Earl of Clanricarde (died 1582); Ulick Burke, 3rd Earl of Clanricarde, (died 1601), Irish peer; Richard Burke, 4th Earl of Clanricarde (1572-1635), an Irish nobleman; Ulick Burke, 1st Marquess of Clanricarde (1604-1657), was an...
Migration of the McGillack family
Ireland went through one of the most devastating periods in its history with the arrival of the Great Potato Famine of the 1840s. Many also lost their lives from typhus, fever and dysentery. And poverty was the general rule as tenant farmers were often evicted because they could not pay the high rents. Emigration to North America gave hundreds of families a chance at a life where work, freedom, and land ownership were all possible. For those who made the long journey, it meant hope and survival. The Irish emigration to British North America and the United States opened up the gates of industry, commerce, education and the arts. Early immigration and passenger lists have shown many Irish people bearing the name McGillack: Ann Burk who settled in Virginia in 1647; James and Tobias Burk settled in Barbados in 1680; with their servants; Elizabeth Burk settled in Maryland in 1774.
The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.
Motto: Ung roy, ung foy, ung loy
Motto Translation: One king, one faith, one law.