Surname จวงจันทร์ (จวงจันทร์ 
, Juangjan , Juangchan ) , all around the world, is a rare cognomen. The family name จวงจันทร์ is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname. Likewise, จวงจันทร์ is the forename as well as the last name.