GY Views 7 meanings found GY is used as the abbreviation for Goodyear, the country code for Guyana, and the gray (Gy), the SI unit for absorbed radiation, and it also appears in gaming calendars or corporate naming. Medical Grays (units of radiation) Miscellaneous Graveyard Yun genus of Y Community Game Year Governmental Goodyear Regional Guyana Business Gencorp, Inc.