In all the world, 怀森 (怀森 
, Wisan 
, Huaisen 
) is quite a rare predominantly boy's, but scarcely female forename. The first name 怀森 is characteristic of Thailand, where it is a rare male name, China, where it is a very rare predominantly boy's, but very infrequently girly name, and Indonesia, where it is a very rare male name. Also, 怀森 is the last name as well as the forename.