The Shield is: Or, on a fess dancettée azure three estoiles
argent on a canton of the second the sun in his glory proper.
The Crest is: An arm erect, vested gules cuffed argent holding in the hand proper five ears of wheat or.
The Motto is: "In lumine lucem", I may shine in the light.
Variant spellings for Thompson: Mc Avish, Mc Tavish, Tomson, and Thomson.
The numerous family name of Thompson ranks among the top 50 names in Ireland, Scotland, and England. It is actually the 4th most common in Scotland and the 15th most common surname in England. Thus, those of the name in Ireland often have Scottish or English backgrounds.
Several other families now using the name of Thompson etc.. in Ireland were originally of another surname entirely.
Mc Tavish and Mc Avish are two such instances. People of these names have changed their names into Thompson on occasion, as documented by the Registrar-General in relatively recent times.
Most of the name are likely of settler origins in Ireland, found mainly in the province of Ulster. Note that the name of Thomson has been said more often to denote a Scottish origin when found in Ireland. When spelled as Thompson it origins are more likely English according to sources in the past.
The Thompson family of Rathnally and Ross, Co. Meath, descend from John Thompson of Muckamore.
The Thompson family of Clonfin, Co. Longford, descend from the first of that family to settle in Ireland, one Capt. William Thompson, b. 1655, who came here with King William II in 1688.
The 1890 birth index finds 317 births of the name, mainly in Antrim, Down, Armagh, Londonderry, Dublin, Fermanagh, and Longford.
The census of 1659 finds Thompson in Wexford, Meath, Armagh, and Clare. The spelling of Thomsone at that time is found in County Donegal.
Arms for the name are found on plate 100 in the Irish Book or Arms.
Source: The Book of Irish Families Great & Small
Michael C. O'Laughin
1997 Irish Genealogical Foundation
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