Guernseyn.

GuernseyChannel Island, the name is Viking. The second element of the name is Old Norse ey "island;" the first element uncertain, traditionally meaning "green," but perhaps rather representing a Viking personal name, such as Grani. Like neighboring Jersey, it was also taken as the name for a coarse, close-fitting vest of wool (1839), worn originally by seamen, and in Australia the word supplies many of the usages of jersey in U.S. As a type of cattle bred there, from 1784.