Cognomen Pansan (Pansan 
, ปันสัน , ปันสาน ) , in the entire world, is a rare last name. The last name Pansan is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Philippines, and Singapore, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Thailand, Philippines, and Brazil. Very seldom, Pansan is the forename as well as the last name.