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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."
"small box for tea," 1792, from Malay kati a weight equivalent to about a pound and a third (in English from 1590s as catty), adopted as a standard mid-18c. by British companies in the East Indies. Apparently the word for a measure of tea was transferred to the chest it was carried in.
A Cadillac automobile: Park that Caddy over there
container for tea. A corrupt form of the Malay kati, a weight of a little more than a pound (or about half a kilogram), the word was applied first to porcelain jars filled with tea and imported into England from China. Many caddies made from silver, copper, brass, pewter, and other decorative materials, such as veneers of tortoiseshell or ivory on wood, were made in the 18th century.