Surname קאי (Kai 
, Cai , קאי 
) , around the world, is a prevalent cognomen. The last name קאי is characteristic of Cayman Islands, where it is a common surname, Malaysia, and British Virgin Islands (explore the name in all countries). Not in comparison with a country's population, it is commonest in China, Malaysia, and the United States. Much less frequently, קאי is the forename as well as the last name.