Definition of "Sawney"

But Sawney grew weary, and fain would be civil, / Being auld, and unfeary, and fail'd of his strength

1812, John Bell, Rhymes of Northern Bards, page 185

“They can live upon barley-meal without a morsel of meat from week-end to week-end, can these miserable Sawnies,” quoth another.

1874 July–December, W. Senior, “With the Herring Fleet”, in The Gentleman's Magazine, page 704