Robert Douglas

(male) One of the many French names of Germanic origin that were introduced into Britain by the Normans; it has since remained in continuous use. It is derived from the nearly synonymous elements hrōd ‘fame’ + berht ‘bright, famous’, and had a native Old English predecessor of similar form (Hreodbeorht), which was supplanted by the Norman name. Two dukes of Normandy in the 11th century bore the name: the father of William the Conqueror (sometimes identified with the legendary Robert the Devil), and his eldest son. It was borne also by three kings of Scotland, notably Robert the Bruce (1274–1329), who freed Scotland from English domination. The altered short form Bob is very common, but Hob and Dob, which were common in the Middle Ages and gave rise to surnames, are extinct. See also Rupert.

Scottish: habitational name from any of the various places called Douglas from their situation on a river named with Gaelic dubh ‘dark’, ‘black’ + glas ‘stream’ (a derivative of glas ‘blue’). There are several localities in Scotland and Ireland so named, but the one from which the surname is derived in most if not all cases is 20 miles south of Glasgow, the original stronghold of the influential Douglas family and their retainers.