Last name ไช่ (Chai 
, Xaii 
, Xye 
) , all over the world, is a widespread family name. The cognomen ไช่ is habitual in Malaysia, where it is a common surname, British Virgin Islands, and Singapore (explore the name in all countries). Measured by absolute frequency, the name is most common in China, Malaysia, and Indonesia. Very seldom, ไช่ is the forename as well as the last name.