GILLIE (from the Gael, gitte, Irish gille or giolla, a servant or boy), an attendant on a Gaelic chieftain; in this sense its use, save historically, is rare. The name is now applied in the Highlands of Scotland to the man-servant who attends a sportsman in shooting or fishing. A gittie-wetfoot, a term now obsolete (a translation of gillie-casfliuch, from the Gaelic cas, foot, and fliuch, wet), was the gillie whose duty it was to carry his master over streams. It became a term of contempt among the Lowlanders for the " tail " (as his attendants were called) of a Highland chief.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)