Last name Tongsen (同森 
, Tongsen 
) , around the globe, is a rare surname. The surname Tongsen is characteristic of Thailand, where it is a rare surname, China, where it is a very rare surname, and Chile, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in China, Thailand, and Nigeria. More frequently, Tongsen is the forename as well as the last name.