Surname คำมั่น (Khamman 
, คำมั่น) , globally, is a rare cognomen. The family name คำมั่น is characteristic of Thailand, where it is a rare surname, India, where it is an extremely rare surname, and Malaysia. Measured by absolute frequency, it most frequently occurs in Thailand, India, and Nigeria. More frequently, คำมั่น is the forename as well as the last name.