Cognomen บุญใจ (Merit 
, บุญใจ 
, Boonjai ) , in all the world, is quite a common last name. The cognomen บุญใจ is habitual in Nigeria, where it is quite a rare surname, Thailand, where it is a rare surname, and Ghana. Not in comparison with a country's population, it most frequently occurs in Nigeria, Mexico, and Thailand. Also, บุญใจ is the forename as well as the last name.