Cognomen Кусуй (Kusui 
, Кусуй 
) , throughout the world, is a very rare family name. The family name Кусуй is habitual in Kyrgyzstan, where it is a very rare surname, New Zealand, and Malaysia, where it is an extremely rare surname. In absolute terms, it is commonest in Kyrgyzstan, Malaysia, and India. More frequently, Кусуй is the forename as well as the last name.