Pet form of Judith, recorded from the 17th century. It was the name adopted by the singer and film star Judy Garland (1922–69, original name Frances Gumm), and has since increasingly been used as an independent name.
Scottish: habitational name from a place the location of which is disputed. Black gives two Scottish options, the first with no explanation, the second being Halley in Deerness, Orkney. Modern Scottish bearers may well get it from the Irish names (see 3 and 4 below).