Worldwide, คอย (Khoi 
, คอย 
) is quite a common predominantly male, but very infrequently feminine forename. The first name คอย is characteristic of Vietnam, where it is quite a rare masculine name, Australia, where it is a rare masculine name, and Thailand, where it is a rare epicene name. In absolute terms, this name is the most popular in Vietnam, the United States, and India. Much less frequently, คอย is the last name as well as the forename.