Cognomen เบญจกาญจน์ (เบญจกาญจน์ 
, Benjakarn , Benchakan ) , around the globe, is a rare family name. The cognomen เบญจกาญจน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Also, เบญจกาญจน์ is the forename as well as the last name.