Surname ด้าย (Dai 
, ด้าย) , in all the world, is a prevalent family name. The last name ด้าย is characteristic of Cayman Islands, where it is a common surname, Bermuda, where it is quite a common surname, and China (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in China, India, and Indonesia. Very seldom, ด้าย is the forename as well as the last name.