Cognomen チャイ (Chai 
, Chay 
, チャイ 
) , in the world, is a widespread surname. The cognomen チャイ is characteristic of 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 Myanmar. Very seldom, チャイ is the forename as well as the last name.