According to a family history published in the 1980's by the late Robt. Gass of South Africa, the name derives from gasg. This is a place name peculiar to Scotland and Ireland which means a tail-like piece of land running out from a plateau.Because there is no letter K in Gaelic the name has evolved from Gasg, to Gasc, Gask, Gass and even Gash. ( German and Swiss Gass families appare unrelated; their name deriving from the word gasse meaning narrow street or alley)
The Scottish Gasses are supposed to have originated in Trinity Gask, Perthshire, a five by three mile piece of land near Kinkell Bridge.One Andrew of Gaskcame down to the Borders in the 1200's where he had the living of three parishes: Graitney (now Gretna), Dornock and Kirkpatrick-Fleming.Gass families have lived in the Dumfriesshire area since then. In fact 72 of the 200 early burials (late 1600's to mid 1800's) in Dornock churchyard are Gasses.