Surname ประจวบบุญ (ประจวบบุญ 
, Prajuobboon , Prajoapboon ) , around the globe, is a rare last name. The last name ประจวบบุญ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ประจวบบุญ is the forename as well as the last name.