In the world, Кои (Koi 
, Кои 
) is quite a common unisex given name. The first name Кои is characteristic of Macao, where it is quite a rare boy's name, Japan, where it is quite a rare largely male, but infrequently feminine name, and Oman, where it is a rare masculine name. Measured by absolute frequency, it is commonest in Japan, India, and Indonesia. Likewise, Кои is the last name as well as the forename.