Meaning

noun a Mid-Atlantic state on the Atlantic; one of the original 13 colonies

noun the largest of the Channel Islands

noun a close-fitting pullover shirt

originFrom Middle English Gersey, from Anglo-Norman Gersui, further etymology disputed. Probably from Old Norse [Term?], compound of Geirs (“Geirr's”) + ey (“island”). Also occasionally and historically connected to Latin Caesarea, a common name given to locations conquered by the Romans in honor of Caesar (compare French Césarée). The latter theory still bestows the Latin translation of the island.

Etymology from Wiktionary, CC BY-SA 3.0