Gunn

Scottish: sometimes an Anglicized form of Gaelic Mac Gille Dhuinn ‘son of the servant of the brown one’ (see Dunn). (According to Woulfe a name of the same form also existed in Sligo, Ireland.)

English: metonymic occupational name for someone who operated a siege engine or cannon, perhaps also a nickname for a forceful person, from Middle English gunne, gonne ‘ballista’, ‘cannon’, ‘gun’. The term originated as a humorous application of the Scandinavian female personal name Gunne or Gunnhildr.