Cognomen เบญจพันธุ์ (Benjaphan 
, เบญจพันธุ์ ) , in the world, is a very rare surname. The family name เบญจพันธุ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, เบญจพันธุ์ is the forename as well as the last name.