Cognomen ฉัย (Chai 
, ฉัย 
) , in all the world, is a widespread last name. The family name ฉัย is habitual in Malaysia, where it is a common surname, British Virgin Islands, and Singapore (explore the name in all countries). In absolute terms, it is the most numerous in China, Malaysia, and Indonesia. Very seldom, ฉัย is the forename as well as the last name.