The french variant of RAY means "spring". Rey in Spain and Southern Frnce means "king". The surname Rey exists in Italy too, but it is very local. Ray is spread also in Mexico: probably some American Ray are of Mexican origin. But the most part of Ray are surely of british origin. At the moment I can't tell you anything about the origin of this surname. There are also German Ray but I do not think that this surname is common in Germany.