Well, that's a no-brainer, gents. The first pro at Moortown, Tariq ibn Ziyad, fresh off a stint from defeating the Visigoths in an international unfriendly in southern Hispania (down on that-there Iberian peninsula), came upon this particular hole at the course during a match and decided that this personal mountain (gibr in Arabic) would serve as a metaphor for overcoming persuasive obstacles. He also declared that the hole should change its location (hole number) on the course from time to time, to never be a stationary/static mountain. Hence, Gibraltar (mountain of Taric) established its place in the lore of golfing legend, thanks to a golf-smitten Muslim general.