Family name แปลงวงศ์ (Plomwong 
, แปลงวงศ์ ) , across the world, is a very rare cognomen. The surname แปลงวงศ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, แปลงวงศ์ is the forename as well as the last name.