Cognomen ช่าย (Chai 
, ช่าย) , all over the world, is a widespread last name. The cognomen ช่าย is habitual in Malaysia, where it is a common surname, British Virgin Islands, and Singapore (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in China, Malaysia, and Indonesia. Very seldom, ช่าย is the forename as well as the last name.