Worldwide, กวนใจ (Kuanjai 
, กวนใจ , Guanjai ) is a very rare dominantly feminine, but seldom boy's first name. The given name กวนใจ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare mostly feminine, but seldom masculine name. Much less frequently, กวนใจ is the last name as well as the forename.