Ailysoom History, Family Crest & Coats of Arms
Ailysoom is a very old Scottish name that may even date back to the Dalriadan tribe of Scotland's western coast and Hebrides islands. It comes from the name for the son of "Ellis" or Ellis' son. Conversely, the surname could be is derived from "Alice" as in "the son of Alice." It is likely though that the name was derived from "Ellis" rather than the female personal name.  
But Black goes on stating there is some dispute as to the origin: "On the other hand, with reference to Scottish Alison or Allison, Mr. L. A. Morrison in his The History of the Alison or Allison family in Europe and America, Boston, 1893, says that it is 'a fact beyond doubt that Alison comes from Alister or Alexander, and, further, that the Alisons are offshoots of the famous Clan of MacAlister" (p. 4), and that the origin of the name is due to two sons of Alexander MacAlister of Loupe who with some of their followers escaped to the parish of Avondale, Lanarkshire, during the War of Independence, and there later their name was changed from MacAlister to Alison (p. 18). He further states that 'the names Alison, Allison, Alinson, Allinson, and of Elison, Ellison, Elissen, Ellysen, are found thus spelled in the early history of some branches of the present Allison family. They are interchangeably mixed. The name was often spelled Ellison and Allison when referring to the same individual.' " 
Early Origins of the Ailysoom family
The surname Ailysoom was first found in the county of Lanarkshire (Gaelic: Siorrachd Lannraig) a former county in the central Strathclyde region of Scotland, now divided into the Council Areas of North Lanarkshire, South Lanarkshire, and the City of Glasgow, where they acquired some time before 1300 the territories of their family seat at Loupe. They were descended from Angus Mor MacDonnell, Lord of the Isles, their Gaelic name was MacAllister, and it is difficult through history to distinguish one name from the other.
One of the first clear records of the family was "Patrick Alissone del counte de Berewyk rendered homage, 1296."  This is an early record of Patrick's swearing allegiance to King Edward I of England, shortly after his invasion of Scotland.
Continuing, we found "Peter Alesoun was a witness in Brechin, 1490 (REB,, II, 134), Thomas Alesoun appears in Lochtoun, Scone, 1586 (Scon, p. 232), James Allasone was bailie of Ranfrew, 1688 (RPC., 3. ser. XIII, p. 243), and Gabriel Alason was bailie of the burgh of Dumfries, 1693." 
Early History of the Ailysoom family
This web page shows only a small excerpt of our Ailysoom research. Another 42 words (3 lines of text) covering the years 1296, 1314 and are included under the topic Early Ailysoom History in all our PDF Extended History products and printed products wherever possible.
Ailysoom Spelling Variations
Spelling variations are a very common occurrence in records of early Scottish names. They result from the repeated and inaccurate translations that many names went through in the course of various English occupations of Scotland. Ailysoom has been spelled Allison, Alison, Alinson, Allinson, McAllister, MacAllister, Ellison and many more.
Early Notables of the Ailysoom family (pre 1700)
More information is included under the topic Early Ailysoom Notables in all our PDF Extended History products and printed products wherever possible.
Migration of the Ailysoom family to Ireland
Some of the Ailysoom family moved to Ireland, but this topic is not covered in this excerpt.
Migration of the Ailysoom family
Numerous Scottish settlers settled along the east coast of the colonies that would become the United States and Canada. Others traveled to the open country of the west. At the time of the American War of Independence, some remained in the United States, while those who remained loyal to the crown went north to Canada as United Empire Loyalists. The highland games and Clan societies that sprang up across North America in the 20th century have helped many Scots to recover parts of their lost traditions. Research into passenger and immigration lists has revealed some of the very first Ailysooms to arrive in North America: William Allison who settled in Pennsylvania in 1764.