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1630s, Scottish form of French cadet (see cadet). Originally "person who runs errands;" meaning of "golfer's assistant" is 1851. A letter from Edinburgh c.1730 describes the city's extensive and semi-organized "Cawdys, a very useful Black-Guard, who attend ... publick Places to go at Errands; and though they are Wretches, that in Rags lye upon the Stairs and in the Streets at Night, yet are they often considerably trusted .... This Corps has a kind of Captain ... presiding over them, whom they call the Constable of the Cawdys."
A Cadillac car: And we'll rent a black Caddy (1920s+)