Surname சாய் (Cai 
, Tsai , சாய்) , around the world, is a prevalent family name. The cognomen சாய் is characteristic of Cayman Islands, where it is a common surname, Taiwan, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is the most numerous in China, Taiwan, and the United States. Very seldom, சாய் is the forename as well as the last name.