I believe it's Irish, but what is the origin/geographical region?
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Scottish (Galloway) and northern Irish: from the Scottish personal name Adair, also spelled Ed?ear, a form of Edgar.
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Yes it is Scottish, but, according to Edward MacLysaght, there was a family called O Daire in Co. Offaly, Ireland, who adopted Adair as the English language version of their surname. It seems they account for very few present-day Adairs.
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