It can mean gray ( color , hue ). It also means set of faithful, group of gregarious. Congregation, group, set, parish, community, herd, herd, herd, herd. Also, Grey, is a surname of English origin. Last name of the main character of the television series "Grey's Anatomy", represented by actress Ellen Pompeo and named Meredith Grey. In the series, this doctor is the daughter of another ciurjana with the same surname, named Ellis Grey.