Family name Каи (Kai 
, Cay , Каи 
) , around the world, is a widespread surname. The surname Каи is habitual in Malaysia, where it is a common surname, Macao, where it is quite a common surname, and Lebanon (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Malaysia, China, and Myanmar. Also, Каи is the forename as well as the last name.