English (common in Northumberland and the Scottish Borders):
Middle English nickname for someone who was strong in the arm.
Irish: adopted as an English equivalent of Gaelic Ó
Labhradha Tréan ‘strong O’Lavery’ or Mac Thréinfhir,
literally ‘son of the strong man’, both from Ulster.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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