Last name Jamjan (Jamjan 
, แจ่มจันทร์) , across the world, is a rare surname. The last name Jamjan is characteristic of Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and South Africa, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in Thailand, Malaysia, and the United States. More prevalently, Jamjan is the forename as well as the last name.