In all the world, Chaiyanun (ชัยนันท์ 
, Chaiyanun ) is a rare principally male, but very seldom female first name. The forename Chaiyanun is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare principally male, but very infrequently feminine name. Much less frequently, Chaiyanun is the last name as well as the forename.