Surname Sansun (Sansun 
, ซันซัน ) , in all the world, is a very rare cognomen. The cognomen Sansun is habitual in Thailand, where it is a very rare surname, the United Kingdom, and Spain, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Thailand, the United Kingdom, and Philippines. Predominantly, Sansun is the forename as well as the last name.